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

1,2

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.

Links

Table of n, a(n) for n=1..29.

Crossrefs

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

Sequence in context: A139204 A122661 A133481 * A351175 A099535 A370920

Adjacent sequences: A274546 A274547 A274548 * A274550 A274551 A274552

Keyword

nonn,more

Author

Timothy L. Tiffin, Jun 27 2016

Status

approved