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.
We love vectorized solutions. Problem 1 : remove the row average.
03 - Matrix Variables 3
Largest Prime Number
Product of Array
Rotate a matrix for 180 degree
prime to each other
Number of occurrences of letter in a text
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