A262623 - OEIS

%I #56 Jan 23 2023 14:46:00

%S 12285,14595,67095,71145,69615,87633,100485,124155,122265,139815,

%T 522405,525915,802725,863835,947835,1125765,1175265,1438983,1280565,

%U 1340235,1358595,1486845,1798875,1870245,4482765,5120595,5357625,5684679,5730615,6088905,6377175,6680025,8619765,9627915,9071685,9498555,9206925,10791795

%N Amicable pairs of odd numbers.

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

%C First differs from A262625 at a(4).

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

%H Amiram Eldar, <a href="/A262623/b262623.txt">Table of n, a(n) for n = 1..20000</a>

%H Sergei Chernykh, <a href="http://sech.me/ap/">Amicable pairs list</a>

%o (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

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

%K nonn,tabf

%O 1,1

%A _Omar E. Pol_, Nov 09 2015