Another trick: if the last 4 digits of the number are divisible by 16, the full number is divisible by 16. So far as I know, if the last X digits of a number are divisible by 2^X, the entire number is divisible by 2^X.
@James: nice trick! (and I guess the proof arises from 10^x being always exactly divisible by 2^x, so "iff" also applies?)
perhaps less interesting but I guess you could do the same with powers of 5, iff the last X digits of a number are divisible by 5^x, then the entire number is divisible by 5^x...
Implement a ROT13 cipher
Given area find sides
subtract central cross
Area of a Square
5 Prime Numbers
Lights Out 14 - 5x5, four stages, x moves
Rule of mixtures (composites) - other bound
Self-similarity 2 - Every third term
Large Sum (inspired by Project Euler 13)
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