A089279 a(n) = 2 + sum(k=1 to n) [(-1)^k A001511(k)].

1, 3, 2, 5, 4, 6, 5, 9, 8, 10, 9, 12, 11, 13, 12, 17, 16, 18, 17, 20, 19, 21, 20, 24, 23, 25, 24, 27, 26, 28, 27, 33, 32, 34, 33, 36, 35, 37, 36, 40, 39, 41, 40, 43, 42, 44, 43, 48, 47, 49, 48, 51, 50, 52, 51, 55, 54, 56, 55, 58, 57, 59, 58, 65, 64, 66, 65, 68, 67, 69, 68, 72

Offset

1,2

Comments

a(2^n) = 2^n+1.

Links

Table of n, a(n) for n=1..72.

Formula

a(2n+1) = A101925(n), a(2n+2) = a(2n+3)+1. - Ralf Stephan, Dec 28 2004

Crossrefs

Cf. A001511, A005187, A101925.

Sequence in context: A062327 A075491 A326730 * A049820 A109712 A095049

Adjacent sequences: A089276 A089277 A089278 * A089280 A089281 A089282

Keyword

nonn

Author

Gary W. Adamson, Oct 28 2003

Extensions

Edited by Don Reble, Nov 15 2005

Status

approved