1,2

Seven terms found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]). There are no more terms <= 2100.

Table of n, a(n) for n=1..7.

3 is a term as 3! * p(3)# + 1 = 3*2*1 * 5*3*2 + 1 = 181, a prime.

Cf. A118223.

Sequence in context: A163488 A215536 A173355 * A191594 A208204 A067092

Adjacent sequences: A118219 A118220 A118221 * A118223 A118224 A118225

nonn

Rick L. Shepherd, Apr 15 2006

approved