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 A015976 One iteration of Reverse and Add is needed to reach a palindrome. 6
 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 Index entries for sequences related to Reverse and Add! MATHEMATICA rev[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[106], rev[x = # + rev[#]] == x &] (* Jayanta Basu, Jul 24 2013 *) Select[Range[120], PalindromeQ[#+IntegerReverse[#]]&] (* Harvey P. Dale, Jul 04 2022 *) 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: A054930 A329230 A119798 * A370842 A098892 A174139 Adjacent sequences: A015973 A015974 A015975 * A015977 A015978 A015979 KEYWORD nonn,base,look AUTHOR Robert G. Wilson v EXTENSIONS Offset corrected by Reinhard Zumkeller, Oct 14 2011 STATUS approved

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Last modified July 13 01:42 EDT 2024. Contains 374259 sequences. (Running on oeis4.)