1,2

a(1) through a(25) have been proved to be prime with WinPFGW. a(25) has 5600 digits. No more terms up to 12800.

Results were computed using the PrimeFormGW (PFGW) primality-testing program. - Hugo Pfoertner, Nov 14 2019

Table of n, a(n) for n=1..25.

a(4)=9 because 333 * 2^9 + 1 = 170497, a prime.

Sequence in context: A265016 A279897 A336131 * A316429 A337639 A047161

Adjacent sequences: A095964 A095965 A095966 * A095968 A095969 A095970

more,nonn,base

Jason Earls, Jul 15 2004

approved