Be careful, I've implemented the sieve, but not all versions of it are sufficiently fast to handle the biggest numbers in the test suite.
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This doesn't use primes(x),but still feels a little like cheating.
The whole point of using the sieve is not knowing which numbers are prime. So it is no different than sum(primes).
Finding Perfect Squares
Indexed Probability Table
Sum of diagonal of a square matrix
Sum of odd numbers in a matrix
Divisible by 3
Permute diagonal and antidiagonal
Numbers spiral diagonals (Part 2)
Narcissistic number ?
Add more zeros
Pandigital number n°1 (Inspired by Project Euler 32)
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