A377672 a(n) is the number of divisors of n^n + n.
2, 4, 8, 12, 8, 32, 48, 48, 12, 128, 16, 24, 16, 256, 64, 80, 32, 96, 1536, 96, 64, 1024, 64, 96, 96, 512, 512, 3072, 64, 128, 2048, 384, 128, 8192, 128, 1152, 256, 128, 32, 2048, 128, 128, 6144, 288, 768, 262144, 64, 480, 1536, 1536, 2048, 3072, 1024, 1024
Offset: 1
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 1..116
Programs
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Mathematica
a[n_] := DivisorSigma[0, n^n + n]; Array[a, 45] (* Amiram Eldar, Nov 04 2024 *)
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PARI
a(n) = numdiv(n^n+n);