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A337609
Positive integers m such that A126286^k(m) = m for some positive integer k.
4
2, 3, 14, 21, 26, 34, 38, 39, 50, 57, 62, 74, 75, 85, 86, 93, 94, 98, 110, 111, 118, 122, 129, 134, 142, 146, 147, 154, 158, 165, 170, 182, 183, 194, 201, 202, 206, 214, 218, 219, 230, 235, 237, 242, 254, 255, 266, 273, 274, 278, 286, 290, 291, 298, 302, 309
OFFSET
1,1
COMMENTS
A126286^k(m) means apply A126286 to m k times.
Equivalently, the numbers that belong to a cycle under the map x -> A126286(x).
For any term m in this sequence, A126286(A126286(m)) = m.
Supersequence of A017545. Moreover, this sequence can be represented as an infinite union of arithmetic progressions.
2 and 3 are the only primes in this sequence.
EXAMPLE
3 is a term since A126286(A126286(3)) = A126286(2) = 3.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ely Golden, Oct 07 2020
STATUS
approved