This doesn't use primes(x),but still feels a little like cheating.
Finding Perfect Squares
Given an unsigned integer x, find the largest y by rearranging the bits in x
Project Euler: Problem 7, Nth prime
Perfect Square or not
Vectors counting by 2
Expression or variable?
Numbers spiral diagonals (Part 2)
Divisors for big integer
Find indices of diagonal elements
What is the scope of variables in Matlab ?
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