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 A015990 Nine iterations of Reverse and Add are needed to reach a palindrome. 1
 1397, 1487, 1577, 1667, 1757, 1847, 1937, 2396, 2486, 2576, 2666, 2756, 2846, 2936, 2999, 3395, 3485, 3575, 3665, 3755, 3845, 3935, 3998, 4394, 4484, 4574, 4664, 4754, 4844, 4934, 4997, 5393, 5483, 5573, 5663, 5753, 5843, 5933, 5996, 6392, 6482, 6572, 6662, 6752, 6842, 6932, 6995 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. The corresponding sequence excluding palindromes is A065214. LINKS Table of n, a(n) for n=1..47. Index entries for sequences related to Reverse and Add! MATHEMATICA ra9Q[n_]:=Length[NestWhileList[#+FromDigits[Reverse[IntegerDigits[ #]]]&, n, IntegerDigits[ #]!= Reverse[IntegerDigits[#]]&, 1, 10]]==10; Select[ Range[ 7000], ra9Q] (* Harvey P. Dale, Mar 08 2015 *) CROSSREFS Cf. A002113. Different from A065214. Sequence in context: A069366 A163054 A110844 * A065214 A336738 A271549 Adjacent sequences: A015987 A015988 A015989 * A015991 A015992 A015993 KEYWORD nonn,base AUTHOR Robert G. Wilson v EXTENSIONS Corrected and extended by Harvey P. Dale, Mar 08 2015 Missing a(27)=4664 inserted by Sean A. Irvine, Dec 20 2018 Offset set to 1 by Alois P. Heinz, Dec 20 2018 STATUS approved

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Last modified September 22 11:59 EDT 2023. Contains 365531 sequences. (Running on oeis4.)