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A298879
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Numbers whose square is not odious.
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0
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0, 3, 6, 12, 13, 15, 21, 24, 26, 27, 30, 37, 42, 45, 47, 48, 52, 53, 54, 57, 60, 61, 63, 69, 73, 74, 81, 83, 84, 90, 93, 94, 96, 99, 104, 105, 106, 107, 108, 109, 111, 114, 115, 119, 120, 122, 123, 126, 133, 137, 138, 141, 146, 148, 151, 155, 159
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OFFSET
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1,2
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COMMENTS
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2*n is in the sequence if and only if n is in the sequence.
2*n+1 is in the sequence if and only if n*(n+1) is odious. (End)
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LINKS
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MAPLE
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select(t -> convert(convert(t^2, base, 2), `+`)::even, [$0..200]); # Robert Israel, Feb 02 2018
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MATHEMATICA
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Join[{0}, Select[Range[200], !OddQ[DigitCount[#^2, 2][[1]]] &]]
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PROG
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(Magma) [n: n in [0..200] | IsEven(&+Intseq(n^2, 2))];
(PARI) isok(n) = (hammingweight(n^2) % 2) != 1; \\ Michel Marcus, Jan 31 2018
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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