id:A163809 - OEIS Search Results

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Write n in binary. Insert a 0 in the middle of each pair of two consecutive 1's. a(n) = the decimal value of the result.

+0
2

1, 2, 5, 4, 5, 10, 21, 8, 9, 10, 21, 20, 21, 42, 85, 16, 17, 18, 37, 20, 21, 42, 85, 40, 41, 42, 85, 84, 85, 170, 341, 32, 33, 34, 69, 36, 37, 74, 149, 40, 41, 42, 85, 84, 85, 170, 341, 80, 81, 82, 165, 84, 85, 170, 341, 168, 169, 170, 341, 340, 341, 682, 1365, 64, 65, 66, 133 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(2n) = A163808(2n). a(2n-1) = A163808(2n-1)/2.`
	EXAMPLE	`13 in binary is 1101. There is one pair of two consecutive 1's. Insert a 0 between these 1's so as to get 10101. a(13) is the decimal equivalent of 10101, which is 21.`
	CROSSREFS	`A163808` `Sequence in context: A011036 A086267 A053424 this_sequence A075771 A132698 A114557` `Adjacent sequences: A163806 A163807 A163808 this_sequence A163810 A163811 A163812`
	KEYWORD	`base,nonn,new`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Aug 04 2009`
	EXTENSIONS	`More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Nov 05 2009`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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