A366819 a(n) is the sum of the divisors of n^n-1.
4, 42, 432, 6048, 67584, 1704240, 38054016, 967814400, 16203253248, 513593801496, 15743437516800, 720045832568832, 19146847615988736, 835966563470742528, 31421980989189888768, 1602925310146310674200, 52064744760120508416000, 4286575920597346109768658
Offset: 2
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 2..138
Programs
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Mathematica
Array[DivisorSigma[1, #^# - 1] &, 18, 2] (* Michael De Vlieger, Oct 24 2023 *)
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PARI
a(n) = sigma(n^n-1);