1,1

We conjecture that, for all n, a(n)>0.

Integer parts of sqrt(a(n)-1) are 3,13,61,291,523,3001,1913,4793,... (as for all terms of A242719, if a(n)-1 is perfect square, then sqrt(a(n)-1) is prime).

Table of n, a(n) for n=1..8.

Cf. A246502, A242719, A242720.

Sequence in context: A279292 A099711 A203532 * A120977 A034830 A098345

Adjacent sequences: A246498 A246499 A246500 * A246502 A246503 A246504

nonn,more

Vladimir Shevelev, Aug 27 2014

More terms from Peter J. C. Moses, Aug 27 2014

approved