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
Offset: 2
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 2..115
Programs
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Mathematica
a[n_] := DivisorSigma[1, n^n - n]; Array[a, 20, 2] (* Amiram Eldar, Nov 04 2024 *)
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PARI
a(n) = sigma(n^n-n);