1,28

R. H. Hardin, Table of n, a(n) for n=1..1000

Cf. A001405.

Sequence in context: A161292 A185219 A161319 * A161038 A161089 A161305

Adjacent sequences: A161250 A161251 A161252 * A161254 A161255 A161256

nonn

R. H. Hardin, Jun 06 2009

approved