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 8 - Matrix Diagonals
Add two numbers
construct matrix with identical rows
Flip the vector from right to left
Create sequnce 1 4 9 16 25.........
prime to each other
Number of occurrences of letter in a text
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