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A004761
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Numbers n such that binary expansion does not begin 11.
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3
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0, 1, 2, 4, 5, 8, 9, 10, 11, 16, 17, 18, 19, 20, 21, 22, 23, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 128, 129
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(0)=1, a(1)=1 and for k>0: a(k*2)=a(k*2-1)+1, a(k*2+1)=a(k+1)*2. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 09 2002
For n>0, a(n) = 1/2 * (4n - 3 - A006257(n-1)). - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 16 2003
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CROSSREFS
| Apart from initial terms, same as A004754.
Sequence in context: A072008 A175141 A072756 * A004754 A010450 A035231
Adjacent sequences: A004758 A004759 A004760 * A004762 A004763 A004764
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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