id:A115118 - OEIS Search Results

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Number of imprimitive (periodic) n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed.

+0
3

0, 0, 1, 1, 2, 1, 3, 1, 4, 2, 5, 1, 10, 1, 11, 5, 20, 1, 36, 1, 58, 11, 95, 1, 196, 4, 317, 30, 598, 1, 1153, 1, 2068, 95, 3857, 13 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`a(p)=1 for prime p. Presumably a(n)=A115121(n)=A066656(n)/2 for odd n.`
	FORMULA	`a(n)=A000013(n) - A000048(n).`
	CROSSREFS	`Sequence in context: A064576 A113308 A143862 this_sequence A115121 A124072 A100053` `Adjacent sequences: A115115 A115116 A115117 this_sequence A115119 A115120 A115121`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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