This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A291550 Even amicable pairs whose sum is not divisible by 9. 1
 666030256, 696630544, 967947856, 1031796176, 2840437756, 3156691844, 4150593232, 4213181968, 4796703664, 4855069456, 10168398448, 11159012552, 33707179456, 33844856128, 53151801712, 55270703248, 62393407792, 65270990608, 107122129216, 107620508608, 284624443948, 287125556692 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Most even amicable pairs have a sum which is divisible by 9; for instance, the sum of (220, 284) is 504. LINKS Elvin Lee, On divisibility by nine of the sums of even amicable pairs, Math. Comp. 23 (1969), 545-548. EXAMPLE (666030256, 696630544) is an amicable pair whose sum is 571750000640 == 8 (mod 9). CROSSREFS Cf. A063990, A180164, A259180, A291422. Sequence in context: A290039 A289958 A263894 * A234071 A234795 A035795 Adjacent sequences:  A291547 A291548 A291549 * A291551 A291552 A291553 KEYWORD nonn,tabf AUTHOR Michel Marcus, Aug 26 2017 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 March 20 16:59 EDT 2018. Contains 300989 sequences. (Running on oeis4.)