1,1

Conjecture. All terms are primes except for a finite set of squares of primes.

All terms from a(1) to a(5000) are primes except for a(21) = 121 = 11^2, supporting V. Shevelev's conjecture. [From John W. Layman, Jul 22 2010]

Table of n, a(n) for n=1..56.

Cf. A139099 A179383 A179481

Sequence in context: A191377 A095070 A079733 * A216371 A095747 A132779

Adjacent sequences: A179535 A179536 A179537 * A179539 A179540 A179541

nonn

Vladimir Shevelev, Jul 18 2010

Terms a(31)-a(56) from John W. Layman, Jul 22 2010

approved