A088843 Number of divisors of multiply-perfect numbers.

1, 4, 6, 16, 10, 24, 14, 96, 96, 80, 216, 320, 26, 384, 480, 288, 576, 224, 34, 1920, 2304, 1056, 480, 896, 38, 960, 1344, 3456, 1620, 5280, 6336, 3888, 10368, 9216, 2816, 3584, 6480, 16384, 5400, 9600, 62, 25344, 12960, 41472, 110592, 32256, 62208, 51840, 48384

Offset: 1

Author

Labos Elemer, Nov 05 2003

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..1600 (calculated from the b-file at A007691)

Crossrefs

Cf. A000005, A007691.

Programs

Mathematica

s = {}; Do[If[Divisible[DivisorSigma[1, n], n], AppendTo[s, DivisorSigma[0, n]]], {n, 1, 10^6}]; s (* Amiram Eldar, Jul 20 2019 *)

Formula

a(n) = A000005(A007691(n)).

Extensions

More terms from Michel Marcus, Sep 19 2013

Data corrected by Amiram Eldar, Jul 20 2019