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A033656 Trajectory of 21 under map x->x + (x-with-digits-reversed). 0
21, 33, 66, 132, 363, 726, 1353, 4884, 9768, 18447, 92928, 175857, 934428, 1758867, 9447438, 17794887, 96644658, 182289327, 906271608, 1712444217, 8836886388, 17673772776, 85401510447, 159803020905 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = A033653(n-1), n>1. [From R. J. Mathar, Oct 22 2008]
MATHEMATICA
NestList[#+IntegerReverse[#]&, 21, 30] (* Harvey P. Dale, Dec 16 2021 *)
CROSSREFS
Sequence in context: A354837 A280878 A033901 * A270074 A350099 A032792
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified July 20 18:59 EDT 2024. Contains 374459 sequences. (Running on oeis4.)