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! The point is to discover something interesting and something new!
Question 7
Let N be a decimal number using only the numerals 0 and 1.
Find the smallest number of digits of N such that N is divisible by 56.
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