A291550 Even amicable pairs whose sum is not divisible by 9.

666030256, 696630544, 967947856, 1031796176, 2840437756, 3156691844, 4150593232, 4213181968, 4796703664, 4855069456, 10168398448, 11159012552, 33707179456, 33844856128, 53151801712, 55270703248, 62393407792, 65270990608, 107122129216, 107620508608, 284624443948, 287125556692

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

Amiram Eldar, Table of n, a(n) for n = 1..1134 (terms below 10^20)

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