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A334167
a(n) is the number of divisors of n^n-1.
6
2, 4, 8, 12, 16, 16, 96, 128, 48, 16, 256, 48, 32, 128, 128, 40, 512, 12, 2048, 768, 256, 64, 6144, 4096, 768, 512, 4096, 768, 24576, 16, 6144, 768, 8192, 1024, 262144, 1152, 256, 1024, 49152, 256, 65536, 64, 24576, 196608, 384, 32, 393216, 327680, 12288, 24576
OFFSET
2,1
COMMENTS
25 values of the first 40 are powers of 2.
LINKS
FORMULA
a(n) = A000005(A048861(n)).
MATHEMATICA
a[n_] := DivisorSigma[0, n^n - 1]; a /@ Range[2, 45] (* Giovanni Resta, Apr 17 2020 *)
PROG
(PARI) a(n) = numdiv(n^n-1); \\ Michel Marcus, Apr 17 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Todor Szimeonov, Apr 17 2020
EXTENSIONS
More terms from Giovanni Resta, Apr 17 2020
STATUS
approved