id:A081869 - OEIS Search Results

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a(1)=2; for n>1, a(n)=2*a(n-1)-1 if that number is composite, a(n)=a(n-1)+1 otherwise.

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2, 3, 4, 5, 9, 10, 11, 21, 22, 23, 45, 46, 91, 92, 183, 365, 729, 1457, 2913, 5825, 11649, 11650, 23299, 46597, 93193, 186385, 186386, 372771, 745541, 1491081, 2982161, 5964321, 5964322, 11928643, 23857285, 47714569, 95429137, 95429138, 190858275 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=s(n)*2^c(n) where c(n) is an integer sequence and s(n) converges to 1.422004961641565758470595....`
	CROSSREFS	`Adjacent sequences: A081866 A081867 A081868 this_sequence A081870 A081871 A081872` `Sequence in context: A118872 A046029 A139456 this_sequence A015837 A075177 A062096`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 12 2003`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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