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A045047
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Numbers whose base-4 representation contains exactly two 0's and no 2's.
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1
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16, 48, 65, 67, 68, 76, 80, 112, 193, 195, 196, 204, 208, 240, 261, 263, 269, 271, 273, 275, 276, 284, 305, 307, 308, 316, 321, 323, 324, 332, 336, 368, 449, 451, 452, 460, 464, 496, 773, 775, 781, 783, 785, 787, 788, 796, 817
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OFFSET
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1,1
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COMMENTS
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If k is in the sequence, then so are 4*k+1 and 4*k+3 but not 4*k or 4*k+2. - Robert Israel, Jan 19 2023
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LINKS
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MAPLE
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filter:= proc(n) local L; L:= convert(n, base, 4);
not member(2, L) and numboccur(0, L)=2
end proc:
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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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STATUS
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approved
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