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.
Return the Fibonacci Sequence
Sum of diagonal of a square matrix
Divisors of an integer
What number has this problem?
Sum of series V
prime to each other
Number of occurrences of letter in a text
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