A274549 Numbers found in the cycles of the iterated sum of deficient divisors function.

1, 6, 15, 18, 19, 20, 22, 24, 28, 34, 36, 42, 48, 52, 54, 76, 78, 84, 90, 98, 140, 171, 260, 308, 336, 496, 8128, 33550336, 8589869056

Offset: 1

Author

Timothy L. Tiffin, Jun 27 2016

Keywords

• nonn
• more

Comments

The 1-cycles (or fixed points) greater than 1 are given in A125310, the 3-cycle terms are given in A274339, the 4-cycle terms are given in A274340 and A274380, and the 10-cycle terms are given in A274338. This sequence was suggested to me by Michel Marcus when I was submitting the 3-cycle, 4-cycle, and 10-cycle sequences.

Crossrefs

Cf. A125310, A187793, A274338, A274339, A274340, A274380.