Write a function to determine if a number is divisible by 15. If a number is divisible by 3 and divisible by 5, then it is divisible by 15.
Previous problem: divisible by 14. Next problem divisible by 16.
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Shortest solution (so far) that keeps to the spirit of the challenge. Code is also easy to read.
Another short solution that keeps to the spirit of the challenge.
Sum all integers from 1 to 2^n
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Divisible by 2
Divisible by n, prime vs. composite divisors
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Is it really a 5?
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