login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A088843 Number of divisors of multiply-perfect numbers. 5
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 (list; graph; refs; listen; history; text; internal format)
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 A062955 A174932

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)