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

Author

Gary W. Adamson, Oct 28 2003

Keywords

• nonn

Comments

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

Crossrefs

Cf. A001511, A005187, A101925.

Formula

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

Extensions

Edited by Don Reble, Nov 15 2005