Get the area codes from a list of phone numbers
Distance walked 1D
Generate N equally spaced intervals between -L and L
Sum the elements in either diagonal of a square matrix
Divisible by 7
Compute a sum of Ramanujan
List the dihedral primes
Determine whether a prime is Pythagorean
Generate a list of composite numbers
Label primes with the Erdos-Selfridge classification
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