A163809 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.

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

Offset

1,2

Comments

a(2n) = A163808(2n). a(2n-1) = A163808(2n-1)/2.

Links

Table of n, a(n) for n=1..67.

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: A053424 A184617 A290886 * A075771 A370697 A198813

Adjacent sequences: A163806 A163807 A163808 * A163810 A163811 A163812

Keyword

base,nonn

Author

Leroy Quet, Aug 04 2009

Extensions

More terms from Sean A. Irvine, Nov 05 2009

Status

approved