id:A086377 - OEIS Search Results

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a(1)=1; a(n)=a(n-1)+2 if n is in the sequence; a(n)=a(n-1)+2 if n and (n-1) are not in the sequence; a(n)=a(n-1)+3 if n is not in the sequence but (n-1) is in the sequence.

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1, 4, 6, 8, 11, 13, 16, 18, 21, 23, 25, 28, 30, 33, 35, 37, 40, 42, 45, 47, 49, 52, 54, 57, 59, 62, 64, 66, 69, 71, 74, 76, 78, 81, 83, 86, 88, 91, 93, 95, 98, 100, 103, 105, 107, 110, 112, 115, 117, 120, 122, 124, 127, 129, 132, 134, 136, 139, 141, 144, 146, 148, 151 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=floor((1+sqrt(2))*n-1/sqrt(2))` `n is in sequence if A004641(n)==1 or A001030(n)==2. a(n) = A080652(n)-1 = A064437(n+1)-2 = A081841(n+2)-3. - Ralf Stephan, Feb 23 2004`
	CROSSREFS	`Sequence in context: A091178 A091181 A047290 this_sequence A003662 A134779 A075325` `Adjacent sequences: A086374 A086375 A086376 this_sequence A086378 A086379 A086380`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 13 2003`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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