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 A033648 Trajectory of 3 under map x->x + (x-with-digits-reversed). 11
 3, 6, 12, 33, 66, 132, 363, 726, 1353, 4884, 9768, 18447, 92928, 175857, 934428, 1758867, 9447438, 17794887, 96644658, 182289327, 906271608, 1712444217, 8836886388, 17673772776, 85401510447, 159803020905, 668823329856, 1327746658722, 3606313135953, 7201626272016 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Normally one stops as soon as a palindrome is reached. A Reverse and Add! sequence. LINKS Reinhard Zumkeller and Alois P. Heinz, Table of n, a(n) for n = 0..1000 (first 251 terms from Reinhard Zumkeller) MAPLE a:= proc(n) option remember; `if`(n=0, 3, (h-> h+ (s->       parse(cat(s[-i]\$i=1..length(s))))(""||h))(a(n-1)))     end: seq(a(n), n=0..40);  # Alois P. Heinz, Jun 18 2014 MATHEMATICA NestList[ # + FromDigits@Reverse@IntegerDigits@# &, 3, 29] (* Robert G. Wilson v, Dec 16 2005 *) PROG (Haskell) a033648 n = a033648_list !! n a033648_list = iterate a056964 3 -- Reinhard Zumkeller, Sep 22 2011 CROSSREFS Cf. A006960, A001127, A033649, A033650, A033651. Cf. A056964, A004086. Row n=3 of A243238. Sequence in context: A288147 A026079 A066710 * A102972 A075209 A075207 Adjacent sequences:  A033645 A033646 A033647 * A033649 A033650 A033651 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified November 30 19:02 EST 2021. Contains 349424 sequences. (Running on oeis4.)