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.
Is A the inverse of B?
Check if number exists in vector
UICBioE240 problem 1.6
Matrix of almost all zeros, except for main diagonal
prime to each other
Number of occurrences of letter in a text
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