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...
Clean the List of Names
Make a random, non-repeating vector.
find radius of cone
Flip the vector from right to left
Lights Out 5 - 5x5, 10 moves
Divisible by 3
Stress-Strain Properties - 5
Fill-a-pix - Solver (basic)
Divisible by 13
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