A328256 Amicable pairs of cyclops numbers.

1280565, 1340235, 71526069316, 75257076284, 1453520375775, 1561230417825, 1568650892445, 1995690781539, 2714480497936, 2854320218864, 5776910172896, 5864460215584, 5818350517628, 6516910297732, 6111770382135, 6139270339785, 9176850735616, 9194440569344, 114552504952875, 123277906567125

Offset: 1

Author

Omar E. Pol, Oct 09 2019

Keywords

• nonn
• base

Comments

Amicable pairs (A259180) where both members are cyclops numbers (A134808).

Is this sequence finite? What is the largest known pair?

Up to 2^64 there are 439 pairs, the largest of them is {9591988390446931328, 9596251990981497472} (Eldar).

Examples

			{1280565, 1340235} is the first amicable pair where both members are cyclops numbers, so a(1) = 1280565 and a(2) = 1340235.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..878
• OEIS Wiki, Cyclops Numbers

Crossrefs

Subsequence of A259180.

Cf. A002025, A002046, A134808, A262622, A262623.

Extensions

More terms from Amiram Eldar, Oct 09 2019