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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 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 A271549 A203918 Adjacent sequences:  A015987 A015988 A015989 * A015991 A015992 A015993 KEYWORD nonn,base AUTHOR 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 May 22 21:05 EDT 2019. Contains 323503 sequences. (Running on oeis4.)