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 A015976 One iteration of Reverse and Add is needed to reach a palindrome. 4
 1, 2, 3, 4, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 38, 40, 41, 42, 43, 44, 45, 47, 50, 51, 52, 53, 54, 56, 60, 61, 62, 63, 65, 70, 71, 72, 74, 80, 81, 83, 90, 92, 100, 101, 102, 103, 104, 105, 106 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. The corresponding sequence excluding palindromes is A065206. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA rev[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[106], rev[x = # + rev[#]] == x &] (* Jayanta Basu, Jul 24 2013 *) PROG (Haskell) a015976 n = a015976_list !! (n-1) a015976_list = filter ((== 1) . a136522 . a056964) [1..] -- Reinhard Zumkeller, Oct 14 2011 CROSSREFS Cf. A002113, A065206. Sequence in context: A193858 A054930 A119798 * A098892 A174139 A037325 Adjacent sequences:  A015973 A015974 A015975 * A015977 A015978 A015979 KEYWORD nonn,base,look AUTHOR EXTENSIONS Offset corrected by Reinhard Zumkeller, Oct 14 2011 STATUS approved

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Last modified October 23 08:57 EDT 2019. Contains 328345 sequences. (Running on oeis4.)