1,1

a(n) is congruent 3 mod 4.

The next term (if it exists) corresponds to some n>23, so it has more than 11 million digits. [R. J. Mathar, Aug 23 2010]

Table of n, a(n) for n=1..3.

Cf. A057726, A152589.

Sequence in context: A203147 A158453 A291128 * A174425 A076068 A062273

Adjacent sequences: A174259 A174260 A174261 * A174263 A174264 A174265

nonn,bref

Giovanni Teofilatto, Mar 14 2010

Entries checked. - R. J. Mathar, Aug 23 2010

approved