Back to basics 21 - Matrix replicating
Convert from Base 10 to base 5
Replace multiples of 5 with NaN
Sum the 'edge' values of a matrix
Divisible by 13
Scrabble Scores - 11
Divisible by n, prime divisors (including powers)
Combined Ages 3 - Non-symmetric, n ≥ 3
Divisible by 16
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