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A132946
Trajectory of 13 under map n -> A132948(n).
3
13, 20, 35, 37, 39, 83, 86, 221, 276, 198, 303, 222, 466, 368, 417, 1439, 1334, 1831, 7841, 4710, 6486, 5900, 4853, 2240, 1237, 5039, 4903, 7927, 20253, 13404, 24127, 46007, 43014, 259691, 607337, 453941, 474549, 1741702, 1866968, 15077819, 138558473, 478592581
OFFSET
0,1
COMMENTS
13 is the smallest number that does not belong to a cycle with elements <= 260000. Further numbers that do not belong to a cycle with elements <= 260000 and do not occur in the trajectory of a smaller number are 15, 32, 45, 59, 72, 76, 81, 85, 95, ... .
Conjecture: Sequence is not periodic.
EXAMPLE
a(1) = A132948(13) = 20; a(2) = A132948(20) = 35.
PROG
(C++) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Sep 14 2007
EXTENSIONS
a(35)-a(40) from Rémy Sigrist, Jan 02 2022
a(41) from Jinyuan Wang, Jul 25 2022
STATUS
approved