A016005 a(n) = (tau(n^9)+8)/9.

1, 2, 2, 3, 2, 12, 2, 4, 3, 12, 2, 22, 2, 12, 12, 5, 2, 22, 2, 22, 12, 12, 2, 32, 3, 12, 4, 22, 2, 112, 2, 6, 12, 12, 12, 41, 2, 12, 12, 32, 2, 112, 2, 22, 22, 12, 2, 42, 3, 22, 12, 22, 2, 32, 12, 32, 12, 12, 2, 212, 2, 12, 22, 7, 12, 112, 2, 22, 12, 112, 2, 60, 2, 12

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A015996, A015999, A016001, A016002, A016003, A016006, A016007, A016008, A016009, A016012.

Programs

Mathematica

a[n_] := (DivisorSigma[0, n^9] + 8)/9; Array[a, 100] (* Amiram Eldar, Jan 27 2025 *)

PARI

A016005(n) = (numdiv(n^9)+8)/9; \\ Antti Karttunen, Jan 17 2017

Extensions

Definition corrected by Vladeta Jovovic, Sep 03 2005