Voozh

A377677

a(n) is the sum of the divisors of n^n - n.

3, 60, 728, 10416, 116064, 2837120, 36990720, 1452853584, 27615698352, 965243666880, 23861701899840, 1355882884941312, 20758574413420992, 1604569397488307712, 93340493714183159808, 3135286584767445151680, 90560273718863022770592, 8284620870197084160000000

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OFFSET

2,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 2..115

FORMULA

a(n) = A000203(A061190(n)).

MATHEMATICA

a[n_] := DivisorSigma[1, n^n - n]; Array[a, 20, 2] (* Amiram Eldar, Nov 04 2024 *)

PROG

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

CROSSREFS