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.
Sum the numbers on the main diagonal
sum of first 'n' terms
07 - Common functions and indexing 4
Determine the square root
factorial of a number x
Number of occurrences of letter in a text
prime to each other
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