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 A029965 Palindromic in bases 9 and 10. 56
 0, 1, 2, 3, 4, 5, 6, 7, 8, 191, 282, 373, 464, 555, 646, 656, 6886, 25752, 27472, 42324, 50605, 626626, 1540451, 1713171, 1721271, 1828281, 1877781, 1885881, 2401042, 2434342, 2442442, 2450542, 3106013, 3114113, 3122213, 3163613 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Robert G. Wilson v and Ray Chandler, Table of n, a(n) for n = 1..66 (terms < 10^18, first 52 terms from Robert G. Wilson v) P. De Geest, Palindromic numbers beyond base 10 MATHEMATICA NextPalindrome[n_] := Block[{l = Floor[ Log[10, n] + 1], idn = IntegerDigits[n]}, If[ Union[idn] == {9}, Return[n + 2], If[l < 2, Return[n + 1], If[ FromDigits[ Reverse[ Take[idn, Ceiling[l/2]] ]] FromDigits[ Take[idn, -Ceiling[l/2]]], FromDigits[ Join[ Take[idn, Ceiling[l/2]], Reverse[ Take[idn, Floor[l/2]] ]]], idfhn = FromDigits[ Take[idn, Ceiling[l/2]]] + 1; idp = FromDigits[ Join[ IntegerDigits[idfhn], Drop[ Reverse[ IntegerDigits[idfhn]], Mod[l, 2]] ]]] ]]]; palQ[n_Integer, base_Integer] := Block[{idn = IntegerDigits[n, base]}, idn == Reverse[idn]]; l = {0}; a = 0; Do[a = NextPalindrome[a]; If[ palQ[a, 9], AppendTo[l, a]], {n, 10000}]; l (* Robert G. Wilson v, Sep 30 2004 *) pQ[n_, k_]:=Reverse[x=IntegerDigits[n, k]]==x; t={}; Do[If[pQ[n, 10] && pQ[n, 9], AppendTo[t, n]], {n, 3.2*10^6}]; t (* Jayanta Basu, May 25 2013 *) CROSSREFS Cf. A007632, A007633, A029961, A029962, A029963, A029964, A029804, A029966, A029967, A029968, A029969, A029970, A029731, A097855, A099165. Sequence in context: A037336 A037443 A073790 * A004881 A004892 A004903 Adjacent sequences:  A029962 A029963 A029964 * A029966 A029967 A029968 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified December 10 13:02 EST 2018. Contains 318048 sequences. (Running on oeis4.)