1,1

Conjecture. Except for the first term a(1)=2, this sequence does not contain terms of the form 4k+2. (This has been confirmed for the first several thousand terms.)

Table of n, a(n) for n=1..102.

Cf. A000217, A067186.

Sequence in context: A318573 A029227 A029214 * A130158 A187497 A325704

Adjacent sequences: A134457 A134458 A134459 * A134461 A134462 A134463

nonn

John W. Layman, Oct 26 2007

approved