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 A015980 Four iterations of Reverse and Add are needed to reach a palindrome. 2
 69, 78, 87, 96, 174, 175, 181, 183, 191, 192, 195, 273, 274, 280, 282, 290, 291, 294, 372, 373, 381, 390, 393, 471, 472, 480, 492, 539, 570, 571, 579, 591, 599, 629, 638, 649, 670, 678, 679, 690, 698, 699, 728, 729, 737, 748, 749, 769, 777 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. The corresponding sequence excluding palindromes is A065209. LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 MATHEMATICA ra4Q[n_]:=With[{c=Rest[NestList[#+IntegerReverse[#]&, n, 4]]}, PalindromeQ[ Last[c]] && NoneTrue[Most[c], PalindromeQ]]; Select[Range[800], ra4Q] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 28 2018 *) CROSSREFS Sequence in context: A295806 A210614 A235226 * A065209 A045021 A254712 Adjacent sequences:  A015977 A015978 A015979 * A015981 A015982 A015983 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified May 26 15:59 EDT 2019. Contains 323597 sequences. (Running on oeis4.)