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A274549
Numbers found in the cycles of the iterated sum of deficient divisors function.
5
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.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Timothy L. Tiffin, Jun 27 2016
STATUS
approved