A066873 - OEIS

A066873

Number of amicable pairs where smaller term of the pair is less than 10^n.

0, 0, 1, 5, 13, 42, 108, 236, 586, 1427, 3340, 7642, 17519, 39374, 87102, 190775, 415523, 901312, 1947667, 4197267

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Shyam Sunder Gupta, Amicable Numbers.

J. O. M. Pedersen, Tables of Aliquot Cycles [Cached copy, pdf file only]

EXAMPLE

There are 13 pairs with smaller term of the pair < 10^5, so a(5) = 13.

CROSSREFS

Cf. A063990, A259180 (amicable pairs).

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

Edited by Klaus Brockhaus, May 31 2003

a(15)-a(18) (from Sergei Chernykh's site) added by Amiram Eldar, Aug 19 2017

a(19) (from Sergei Chernykh's site) added by Amiram Eldar, Apr 05 2019

a(20) (from Sergei Chernykh's site) added by Amiram Eldar, Dec 13 2020

STATUS

approved