A262624 Even amicable numbers.

220, 284, 1184, 1210, 2620, 2924, 5020, 5564, 6232, 6368, 10744, 10856, 17296, 18416, 63020, 66928, 66992, 76084, 79750, 88730, 122368, 123152, 141664, 142310, 153176, 168730, 171856, 176272, 176336, 180848, 185368, 196724, 202444, 203432, 280540, 308620, 319550, 356408, 365084, 389924, 399592, 430402, 437456, 455344

Offset: 1

Author

Omar E. Pol, Oct 02 2015

Keywords

• nonn

Comments

Even numbers that are also amicable numbers.

Intersection of A005843 and A063990.

The first time a pair (x, y) of even amicable numbers ordered by its first element is not adjacent is x = 63020, y = 76084 which correspond to a(15) and a(18), respectively.

Crossrefs

Cf. A002025, A002046, A005843, A063990, A259180, A259933, A262625.

Programs

PARI

t(n)=sigma(n)-n;
is(n)={local(a); a=t(n); a<>n && t(a)==n};
for(n=1, 1e6, if( n%2 == 0 && is(n), print1(n", "))) \\ Altug Alkan, Oct 16 2015