1,2

Table of n, a(n) for n=1..14.

5 is a member because 2*(2*3*5*7*11)+1=4621 is prime

2*A002110[n]+1 is prime. Cf. A051887, A051915.

Sequence in context: A181288 A255260 A052418 * A121432 A118968 A073528

Adjacent sequences: A051797 A051798 A051799 * A051801 A051802 A051803

nonn

Labos Elemer, Dec 20 1999

approved