this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
How long is the longest prime diagonal?
Combinations without using nchoosek
Set the array elements whose value is 13 to 0
Replace multiples of 5 with NaN
Project Euler: Problem 3, Largest prime factor
Poker Series 02: isQuads
Getting the row and column location from a matrix
Poker Series 03: isFullHouse
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