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A234037
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The union of odious numbers with evil squares and evil numbers with odious squares.
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1
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5, 9, 10, 13, 17, 18, 20, 21, 23, 26, 29, 33, 34, 36, 37, 39, 40, 42, 43, 46, 47, 51, 52, 58, 61, 65, 66, 68, 69, 71, 72, 73, 74, 75, 77, 78, 80, 81, 84, 85, 86, 89, 92, 93, 94, 95, 101, 102, 104, 107, 109, 113, 115, 116, 122, 125, 129, 130, 132, 133, 135, 136, 137
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OFFSET
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1,1
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COMMENTS
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Numbers n with odd sum of binary weight of n and binary weight of n^2.
Primes are in this sequence: 5, 13, 17, 23, 29, 37, 43, 47, 61, 71, 73,....
Evil numbers with odious squares: 5, 9, 10, 17, 18, 20, 23, 29, 33, 34,...
Odious numbers with evil squares: 13, 21, 26, 37, 42, 47, 52, 61, 69,...
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LINKS
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EXAMPLE
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a(3) = 10 because 2 (binary weight of 10) + 3 (binary weight of 100) = 5 (odd).
a(4) = 13 because 3 (binary weight of 13) + 4 (binary weight of 169) = 7 (odd).
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MATHEMATICA
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Select[Range[100], Mod[DigitCount[#, 2, 1], 2] != Mod[DigitCount[#^2, 2, 1], 2] &] (* Amiram Eldar, Aug 31 2020 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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