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A262622 Amicable pairs of even numbers. 4

%I #22 Oct 16 2019 16:13:06

%S 220,284,1184,1210,2620,2924,5020,5564,6232,6368,10744,10856,17296,

%T 18416,63020,76084,66928,66992,79750,88730,122368,123152,141664,

%U 153176,142310,168730,171856,176336,176272,180848,185368,203432,196724,202444,280540,365084,308620,389924,319550,430402,356408,399592,437456,455344

%N Amicable pairs of even numbers.

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

%C First differs from A063990, A259180, A259933 at a(13).

%C First differs from A262624 at a(16).

%H Amiram Eldar, <a href="/A262622/b262622.txt">Table of n, a(n) for n = 1..20000</a>

%o (PARI) listap(nn) = {forstep(n=2, 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, A005843, A063990, A259180, A259933, A262623, A262624.

%K nonn,tabf

%O 1,1

%A _Omar E. Pol_, Nov 09 2015

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Last modified August 17 23:40 EDT 2024. Contains 375255 sequences. (Running on oeis4.)