I want to evaluate this function : $F(x) = 1/GCD(1,x) + 2/GCD(2,x) + ... + x/GCD(x,x)$
Is there any short formula rather than taking GCD with all numbers to evaluate this function for given x ?
2026-03-30 02:05:53.1774836353
Evaluate GCD series in best optimal way
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