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A048719
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Binary expansion matches ((0)*0011)*(0*).
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7
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0, 3, 6, 12, 24, 48, 51, 96, 99, 102, 192, 195, 198, 204, 384, 387, 390, 396, 408, 768, 771, 774, 780, 792, 816, 819, 1536, 1539, 1542, 1548, 1560, 1584, 1587, 1632, 1635, 1638, 3072, 3075, 3078, 3084, 3096
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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1-bits occur only in pairs, separated from other such pairs by at least two 0-bits.
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LINKS
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FORMULA
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MATHEMATICA
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filterQ[n_] := With[{bb = IntegerDigits[n, 2]}, !MatchQ[bb, {1}|{1, 0, ___}|{___, 0, 1}|{___, 0, 1, 0, ___}|{___, 1, 1, 1, ___}|{___, 1, 0, 1, ___}]];
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PROG
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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