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
Offset: 1
Examples
There are 13 pairs with smaller term of the pair < 10^5, so a(5) = 13.
Links
- Sergei Chernykh, Amicable pairs list.
- Shyam Sunder Gupta, Amicable Numbers.
- J. O. M. Pedersen, Known Amicable Pairs. [Broken link; WayBackMachine archive.]
- J. O. M. Pedersen, Tables of Aliquot Cycles. [Broken link; WayBackMachine archive.]
- J. O. M. Pedersen, Tables of Aliquot Cycles [Cached copy, pdf file only]
- Index entries for sequences related to amicable numbers
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