A377673 a(n) is the sum of the divisors of n^n + n.
3, 12, 72, 588, 5652, 117504, 1895712, 46503600, 839411118, 25440307200, 474527311344, 22404560101168, 489294047662728, 30902868417576960, 1096805935992340800, 38000593697802058224, 1318965178069293272496, 90596485743469636057920, 3578317312662511683264000
Offset: 1
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 1..116
Programs
-
Mathematica
a[n_] := DivisorSigma[1, n^n + n]; Array[a, 20] (* Amiram Eldar, Nov 04 2024 *)
-
PARI
a(n) = sigma(n^n+n);