A262623 Amicable pairs of odd numbers.

12285, 14595, 67095, 71145, 69615, 87633, 100485, 124155, 122265, 139815, 522405, 525915, 802725, 863835, 947835, 1125765, 1175265, 1438983, 1280565, 1340235, 1358595, 1486845, 1798875, 1870245, 4482765, 5120595, 5357625, 5684679, 5730615, 6088905, 6377175, 6680025, 8619765, 9627915, 9071685, 9498555, 9206925, 10791795

Offset: 1

Author

Omar E. Pol, Nov 09 2015

Keywords

• nonn
• tabf

Comments

If there are no amicable pairs whose members have distinct parity then this is also the odd terms of A259180.

First differs from A262625 at a(4).

References

• Song Y. Yan, Perfect, Amicable and Sociable Numbers. A Computational Approach, World Scientific, 1996, pages 151 - 153.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..20000
• Sergei Chernykh, Amicable pairs list

Crossrefs

Cf. A002025, A002046, A005408, A063990, A259180, A262622, A262625.

Programs

PARI

lista(nn) = {forstep(n=1, nn, 2, m = sigma(n)-n; if ((m > n) && (n==sigma(m)-m), print1(n, ", ", m, ", ")););} \\ Michel Marcus, Nov 14 2015