See Problem 42411 by Grant III
@Jean-Marie Sainthillier: You are right, sorry for not have checked before.
And thank you for the info, the problem-series by Grant III is very useful.
Back to basics 12 - Input Arguments
Make a random, non-repeating vector.
Return 'on' or 'off'
03 - Matrix Variables 4
Number of occurrences of letter in a text
prime to each other
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