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...
Sort a list of complex numbers based on far they are from the origin.
Test for balanced parentheses
Given an unsigned integer x, find the largest y by rearranging the bits in x
frame of the matrix
Divisible by 5
Pattern Recognition 1 - Known Unit Length
Calculator spelling - Letters to Numbers
Scrabble Scores - 5
Lights Out 14 - 5x5, four stages, x moves
Mersenne Primes vs. All Primes
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