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 A029986 Numbers k such that k^2 is palindromic in base 4. 15
 0, 1, 5, 17, 21, 65, 71, 83, 257, 273, 281, 317, 1025, 1055, 4097, 4161, 4193, 4401, 5157, 5179, 5221, 16385, 16511, 16865, 17239, 65537, 65793, 65921, 66753, 68695, 69521, 69777, 80739, 82053, 82171, 82309, 82885, 83301, 262145 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..100 Patrick De Geest, Palindromic Squares MATHEMATICA Select[Range[0, 300000], IntegerDigits[#^2, 4]==Reverse[ IntegerDigits[ #^2, 4]]&] (* Harvey P. Dale, Dec 01 2015 *) PROG (PARI) isok(k) = my(d=digits(k^2, 4)); d == Vecrev(d); \\ Michel Marcus, Jul 04 2021 CROSSREFS Cf. A007090, A014192. Numbers k such that k^2 is palindromic in base b: A003166 (b=2), A029984 (b=3), this sequence (b=4), A029988 (b=5), A029990 (b=6), A029992 (b=7), A029805 (b=8), A029994 (b=9), A002778 (b=10), A029996 (b=11), A029737 (b=12), A029998 (b=13), A030072 (b=14), A030073 (b=15), A029733 (b=16), A118651 (b=17). Sequence in context: A191143 A032376 A145818 * A076275 A316307 A317262 Adjacent sequences:  A029983 A029984 A029985 * A029987 A029988 A029989 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified June 26 21:14 EDT 2022. Contains 354885 sequences. (Running on oeis4.)