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.
LINKS
Rémy Sigrist, C++ program for A132946
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