Thread: summation in pari gp View Single Post
 2022-08-12, 07:51 #1 Adrian   Aug 2022 1 Posts summation in pari gp Is there any command to evaluate in PARI GP such sum: $$\sum\limits_{\substack{2\leq d\leq n \\ (d, n)=1}}\frac{a\left(n\right)}{d}$$? In other words: how to add to command sum(d=2, n, \frac{a(n)}{d}) condition from second line $(d,n)=1$) (or more such conditions) Last fiddled with by LaurV on 2022-08-12 at 09:40 Reason: fixed the formula