<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[RSS Feed]]></title><description><![CDATA[RSS Feed]]></description><link>http://direct.ecency.com</link><image><url>http://direct.ecency.com/logo512.png</url><title>RSS Feed</title><link>http://direct.ecency.com</link></image><generator>RSS for Node</generator><lastBuildDate>Thu, 23 Apr 2026 18:07:11 GMT</lastBuildDate><atom:link href="http://direct.ecency.com/created/brainsteem/rss.xml" rel="self" type="application/rss+xml"/><item><title><![CDATA[Brainsteem Mathematics Challenges: Powers of 2018]]></title><description><![CDATA[Haven't published in ages, so let's have a few warm-up questions over the next days. Question Find the last two digits of 20182018 (If you cannot see the superscript, this is 2018^2018.) This is supposed]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-powers-of-2018</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-powers-of-2018</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sun, 18 Nov 2018 09:05:51 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgn5S3zhLLjnYLjC7Y?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges: Integer Quotients]]></title><description><![CDATA[Haven't posted a mathematical puzzle for a while; time to remedy that! A fairly gentle start, inspired by a Junior Challenge. Question The aim is to fill the inverted pyramid of squares with six different]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-integer-quotients</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-integer-quotients</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Thu, 31 May 2018 12:59:03 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgnHq7vc6W6AwHvDTC?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Quickfire Q.7]]></title><description><![CDATA[Brainsteem Quickfire Q.7 The Brainsteem Quickfire questions should (hopefully) be a bit quicker than the standard questions. As always, these should be done by hand without any computational assistance!]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-quickfire-q-7</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-quickfire-q-7</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Wed, 14 Feb 2018 15:36:06 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgnHq7vc6W6AwHvDTC?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges: 7OKENs]]></title><description><![CDATA[It has been a very long time since the last Brainsteem mathematical puzzle, but I feel it is time to reboot this feature! As always, these are designed to be done by hand; problems in computational mathematics]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-7okens</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-7okens</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sun, 11 Feb 2018 07:03:00 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgnHq7vc6W6AwHvDTC?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges: The Knights and the Round Table]]></title><description><![CDATA[King Arthur was slumped on his throne, glaring at his squabbling knights. Time to fire them up a bit, he thought. "Right! All of you sit down! Time for another Grail quest." The knights groaned;]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-the-knights-and-the-round-table</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-the-knights-and-the-round-table</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sat, 14 Oct 2017 09:53:48 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgnDBmzPXRVopHUfcA?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges - Sums of Squares 2017]]></title><description><![CDATA[A) If we wish to write the number 2017 as the sum of k distinct square numbers, what is the minimum value of k? B) If we wish to write the number 2017 as the sum of q squares of prime numbers, not necessarily]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-sums-of-squares-2017</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-sums-of-squares-2017</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sat, 07 Oct 2017 13:16:03 GMT</pubDate><enclosure url="https://images.ecency.com/p/2bP4pJr4wVimqCWjYimXJe2cnCgn5S3zhLLjnYLjC7Y?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges - Steemit Voting Power]]></title><description><![CDATA[The Question This is a mathematical question related to Steemit. Your Voting Power starts at 100%. Every time you vote, your Voting Power decreases by 2% of the Voting Power you had before the vote. Your]]></description><link>http://direct.ecency.com/math/@rycharde/brainsteem-mathematics-challenges-steemit-voting-power</link><guid isPermaLink="true">http://direct.ecency.com/math/@rycharde/brainsteem-mathematics-challenges-steemit-voting-power</guid><category><![CDATA[math]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sat, 15 Jul 2017 04:39:39 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem #10 Prize Mathematics Puzzle [Win 2 SBD and 1 SBD]]]></title><description><![CDATA[Remember that there are TWO prizes to aim for. The experiment of paying out 40% and 10% has not really worked. I thought it would increase the overall prizes but this hasn't happened yet. What it has done]]></description><link>http://direct.ecency.com/math/@rycharde/brainsteem-10-prize-mathematics-puzzle-win-2-sbd-and-1-sbd</link><guid isPermaLink="true">http://direct.ecency.com/math/@rycharde/brainsteem-10-prize-mathematics-puzzle-win-2-sbd-and-1-sbd</guid><category><![CDATA[math]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Tue, 11 Jul 2017 10:26:48 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges - Drawn Matches]]></title><description><![CDATA[The Question A football tournament involves 6 teams and each team plays all the other teams once. If a team wins a match it gets 3 points, with the loser getting 0; if a match is drawn then both teams]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-drawn-matches</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-drawn-matches</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Mon, 10 Jul 2017 07:19:15 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Compute #4 Prize Computational Maths Puzzle [Win 40% and 10% in SBD]]]></title><description><![CDATA[The Background A palindromic number is one that reads the same in both directions. These include 1331, 10901 and 77777. The largest palindrome made from the product of two 2-digit numbers is 99 x 91 =]]></description><link>http://direct.ecency.com/math/@rycharde/brainsteem-compute-4-prize-computational-maths-puzzle-win-40-and-10-in-sbd</link><guid isPermaLink="true">http://direct.ecency.com/math/@rycharde/brainsteem-compute-4-prize-computational-maths-puzzle-win-40-and-10-in-sbd</guid><category><![CDATA[math]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sat, 08 Jul 2017 16:41:18 GMT</pubDate><enclosure url="https://images.ecency.com/p/82kPqoBYiyUvqzXnYEb4WVsou1wZ13Ns8mg67UzuDYs2?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges - Upside Down Number]]></title><description><![CDATA[The Question A 4-digit integer is shown on a digital screen. If you turn the screen upside down, the new number is 1716 less. Find the original number. This is at the level of a lower secondary national]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-upside-down-number</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-upside-down-number</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Thu, 06 Jul 2017 07:43:18 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Mathematics Challenges - Digital Sum]]></title><description><![CDATA[The Question Find the sum of the digits of 50! For example, 5! = 5x4x3x2x1 = 120, so the sum of the digits is 1+2+0=3, and the digital sum is ds(5!)=3. This is at the level of a middle secondary national]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-digital-sum</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-mathematics-challenges-digital-sum</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Mon, 03 Jul 2017 17:20:06 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Compute #3 Prize Computational Maths Puzzle [Win 40% and 10% in SBD]]]></title><description><![CDATA[Problem #3 is slightly different in that it is more of a research project, perhaps even a collaborative effort. The reason for this is that I'm proposing a question to which I don't know the answer! We]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-compute-3-prize-computational-maths-puzzle-win-40-and-10-in-sbd</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-compute-3-prize-computational-maths-puzzle-win-40-and-10-in-sbd</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Mon, 03 Jul 2017 14:53:15 GMT</pubDate><enclosure url="https://images.ecency.com/p/82kPqoBYiyUvqzXnYEb4WVsou1wZ13Ns8mg67UzuDYs2?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem #8 Prize Maths Puzzle [Win 2SBD+1SBD]]]></title><description><![CDATA[Remember that there are TWO prizes to aim for. Calculate the average value of the expression (a - b)2 + (b – c)2 + (c – d)2 + (d – e)2 + (e – f)2 over all possible arrangements of (a, b, c, d, e, f) of]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-8-prize-maths-puzzle-win-2sbd1sbd</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-8-prize-maths-puzzle-win-2sbd1sbd</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Tue, 27 Jun 2017 12:48:39 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem Quickfire  Q3 [Win 2 SBD + 1 SBD]]]></title><description><![CDATA[Brainsteem Quickfire questions is a series of slightly easier, certainly faster, mathematical challenges in the Brainsteem family! Winner will get 2 SBD or a @randowhale upvote for free! Second prize is]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-quickfire-q3-win-2-sbd-1-sbd</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-quickfire-q3-win-2-sbd-1-sbd</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sun, 25 Jun 2017 07:17:12 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961LJEPZcuoef1B1XC?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[ Brainsteem #7 Prize Maths Puzzle [Win 2SBD+1SBD]]]></title><description><![CDATA[Firstly, remember that there are TWO prizes, so anybody can win the random prize! The Question Suppose n is a product of four distinct primes a, b, c, d such that (i) a(a + b + c + d) = c(d - b); (ii)]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-7-prize-maths-puzzle-win-2sbd1sbd</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-7-prize-maths-puzzle-win-2sbd1sbd</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Fri, 23 Jun 2017 02:29:57 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem #6 Prize Maths Puzzle [Win 2SBD+1SBD]]]></title><description><![CDATA[Firstly, remember that there are TWO prizes, so anybody can win the random prize! Slowly, slowly, let's start to make these Brainsteem Prize Maths Puzzles a bit tougher! There are not many solutions, but]]></description><link>http://direct.ecency.com/education/@rycharde/brainsteem-6-prize-maths-puzzle-win-2sbd-1sbd</link><guid isPermaLink="true">http://direct.ecency.com/education/@rycharde/brainsteem-6-prize-maths-puzzle-win-2sbd-1sbd</guid><category><![CDATA[education]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Wed, 21 Jun 2017 04:19:03 GMT</pubDate><enclosure url="https://images.ecency.com/p/MvwLKy3SfvJwXFKCRMDAFrt961PyqsraqiNnWhksQ?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem #2 - Find the Missing Numbers in this Octagonal Ring]]></title><description><![CDATA[Today's number puzzle should be fairly straightforward! Find the missing numbers in this octagonal ring. What is the pattern or, more correctly, what is the algorithm that links the numbers together? I]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-2-find-the-missing-numbers-in-this-octagonal-ring</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-2-find-the-missing-numbers-in-this-octagonal-ring</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Sat, 10 Jun 2017 08:16:54 GMT</pubDate><enclosure url="https://images.ecency.com/p/o1AJ9qDyyJNSg3j52kokyfvD831NZY7oAQWn8WpsiBocPYxEa?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[Brainsteem: A Prime STEEMIT Number Puzzle]]></title><description><![CDATA[I just made this number puzzle this afternoon to kick off my writing on Steemit. I hope you find it amusing. Take the word STEEMIT and replace each letter with a distinct numeral from 0 to 9 to create]]></description><link>http://direct.ecency.com/mathematics/@rycharde/brainsteem-a-prime-steemit-number-puzzle</link><guid isPermaLink="true">http://direct.ecency.com/mathematics/@rycharde/brainsteem-a-prime-steemit-number-puzzle</guid><category><![CDATA[mathematics]]></category><dc:creator><![CDATA[rycharde]]></dc:creator><pubDate>Tue, 06 Jun 2017 13:36:12 GMT</pubDate><enclosure url="https://images.ecency.com/p/368La1qZAv72fSWvXh4qGjZ1hWPTdjGGZXwvjgNC2g5JDGAMxLjSu5GHtWEv2yYv3QizV5PaThaG8oZQnHSxoxuc?format=match&amp;mode=fit" length="0" type="false"/></item></channel></rss>