A004780 - OEIS

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A004780

Binary expansion contains 2 adjacent 1's.

3, 6, 7, 11, 12, 13, 14, 15, 19, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 35, 38, 39, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 67, 70, 71, 75, 76, 77, 78, 79, 83, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Complement of A003714. It appears that n is in the sequence if and only if C(3n,n) is even. - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2003`
	LINKS	`Reinhard Zumkeller, Table of n, a(n) for n = 1..10000`
	CROSSREFS	`Cf. A005809.` `Sequence in context: A115127 A028754 A028795 * A051146 A136272 A101184` `Adjacent sequences: A004777 A004778 A004779 * A004781 A004782 A004783`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Offset corrected by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 28 2010`

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Last modified February 17 18:34 EST 2012. Contains 206074 sequences.