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

1,2

Links

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

Formula

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

Mathematica

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

Crossrefs

Cf. A000005, A007691.

Sequence in context: A141042 A123667 A129597 * A154784 A328709 A062955

Adjacent sequences: A088840 A088841 A088842 * A088844 A088845 A088846

Keyword

nonn

Author

Labos Elemer, Nov 05 2003

Extensions

More terms from Michel Marcus, Sep 19 2013

Data corrected by Amiram Eldar, Jul 20 2019

Status

approved