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

Author

Michel Marcus, Aug 26 2017

Keywords

• nonn
• tabf

Comments

Most even amicable pairs have a sum which is divisible by 9; for instance, the sum of (220, 284) is 504.

Examples

			(666030256, 696630544) is an amicable pair whose sum is 571750000640 == 8 (mod 9).
		

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.

Crossrefs

Cf. A063990, A180164, A259180, A291422.