id:A004761 - OEIS Search Results

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Numbers n such that binary expansion does not begin 11.

+0
4

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; listen)

	OFFSET	`1,3`
	FORMULA	`a(0)=1, a(1)=1 and for k>0: a(k2)=a(k2-1)+1, a(k2+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`
	CROSSREFS	`Apart from initial terms, same as A004754.` `Sequence in context: A010440 A072008 A072756 this_sequence A004754 A010450 A035231` `Adjacent sequences: A004758 A004759 A004760 this_sequence A004762 A004763 A004764`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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