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.
Reverse Run-Length Encoder
Sum of diagonal of a square matrix
Basics: 'Find the eigenvalues of given matrix
Calculate distance travelled when given radius and rotations
Flip the vector from right to left
Number of occurrences of letter in a text
prime to each other
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