This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A262624 Even amicable numbers. 2
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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. LINKS PROG (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 CROSSREFS Cf. A002025, A002046, A005843, A063990, A259180, A259933, A262625. Sequence in context: A259180 A259933 A273259 * A262622 A287026 A233538 Adjacent sequences:  A262621 A262622 A262623 * A262625 A262626 A262627 KEYWORD nonn AUTHOR Omar E. Pol, Oct 02 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 18 20:29 EDT 2018. Contains 313840 sequences. (Running on oeis4.)