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

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..116

Formula

a(n) = A000203(A066068(n)).

Mathematica

a[n_] := DivisorSigma[1, n^n + n]; Array[a, 20] (* Amiram Eldar, Nov 04 2024 *)

Prog

(PARI) a(n) = sigma(n^n+n);

Crossrefs

Cf. A000203, A066068, A366820, A372228, A372546, A377671, A377672, A377674.

Sequence in context: A147998 A052676 A054640 * A139486 A260622 A348222

Adjacent sequences: A377670 A377671 A377672 * A377674 A377675 A377676

Keyword

nonn

Author

Sean A. Irvine, Nov 03 2024

Status

approved