Most nonzero elements in row
How long is the longest prime diagonal?
Rotate input square matrix 90 degrees CCW without rot90
Set the array elements whose value is 13 to 0
Lychrel Number Test (Inspired by Project Euler Problem 55)
Determine whether a number is unprimeable
Iterate the sum of divisors and totient
Find the nth nude number
List the emirps
Characterize the final state of the digit inventory sequence
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