OFFSET
1,1
EXAMPLE
The trajectory of 707 is part of the trajectory of 106; the trajectory of 775 joins the trajectory of 106 at 48884 after 5 steps.
MATHEMATICA
limit = 10^3; x = NestList[ # + IntegerReverse[#] &, 106, limit];
Select[Range[1199],
Intersection[NestList[ # + IntegerReverse[#] &, #, limit],
x] != {} &] (* Robert Price, Oct 20 2019 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Klaus Brockhaus, May 07 2002
STATUS
approved