|
|
A048717
|
|
Binary expansion matches ((0)*00(1*)11)*(0*).
|
|
8
|
|
|
0, 3, 6, 7, 12, 14, 15, 24, 28, 30, 31, 48, 51, 56, 60, 62, 63, 96, 99, 102, 103, 112, 115, 120, 124, 126, 127, 192, 195, 198, 199, 204, 206, 207, 224, 227, 230, 231, 240, 243, 248, 252, 254, 255, 384, 387, 390, 391
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
In binary expansion, 1-bits occur only in groups of two or more, separated from other such groups by at least two 0-bits.
Integers that satisfy A048727(n) = 3*n.
|
|
LINKS
|
|
|
MATHEMATICA
|
filterQ[n_] := !MatchQ[IntegerDigits[n, 2], {1}|{1, 0, ___}|{___, 0, 1}|{___, 1, 0, 1, ___}|{___, 0, 1, 0, ___}];
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|