a(n) = Sum_{k=1..phi(n)} k*t(k), where t(k) is the k-th positive integer which is coprime to n and phi(n) is the number of positive integers which are <= n and are coprime to n.
A135324
a(n) = Sum_{k=1..phi(n)} k*t(k), where t(k) is the k-th positive integer which is coprime to n and phi(n) is the number of positive integers which are <= n and are coprime to n.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =7a(4) =30a(5) =11a(6) =91a(7) =50a(8) =120a(9) =64a(10) =385a(11) =76a(12) =650a(13) =191a(14) =354a(15) =372a(16) =1496a(17) =243a(18) =2109a(19) =468a(20) =1081a(21) =795a(22) =3795a(23) =560a(24) =3450a(25) =1336a(26) =3033a(27) =1432a(28) =7714a(29) =692
External references
- oeis: A135324