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A029986
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Numbers k such that k^2 is palindromic in base 4.
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15
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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
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Select[Range[0, 300000], IntegerDigits[#^2, 4]==Reverse[ IntegerDigits[ #^2, 4]]&] (* Harvey P. Dale, Dec 01 2015 *)
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PROG
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(PARI) isok(k) = my(d=digits(k^2, 4)); d == Vecrev(d); \\ Michel Marcus, Jul 04 2021
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CROSSREFS
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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).
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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