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The sequence {b(n)} coincides with A075930. Conjecture. For every n>=1, a(n) does exist.

The sequence b(n) is A075930 (Positions of check bits in code in A075928); see comment in that sequence. [From Jeremy Gardiner, May 26 2010]

Table of n, a(n) for n=1..105.

If k=b(n)=2^m*b(s), where b(s) is odd, then a(n)=a(s).

Cf. A000069 A001969 A178253

Cf. A075930. [From Jeremy Gardiner, May 26 2010]

Sequence in context: A060586 A076662 A164359 * A079063 A031352 A245885

Adjacent sequences: A178304 A178305 A178306 * A178308 A178309 A178310

nonn

Vladimir Shevelev, May 24 2010, May 25 2010

Edited by N. J. A. Sloane, May 29 2010

Extended by Jeremy Gardiner, May 26 2010

approved