a(n) = Sum_{k=1..n} gcd(k,n)^(gcd(k,n) - 2).
A342435
a(n) = Sum_{k=1..n} gcd(k,n)^(gcd(k,n) - 2).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =19a(4) =129a(5) =1303a(6) =16813a(7) =262166a(8) =4782981a(9) =100000133a(10) =2357947701a(11) =61917365564
External references
- oeis: A342435