0,1

I think I have a proof that the sequence is infinite.

Table of n, a(n) for n=0..38.

(3*2*3*5*7*11*13*17)/2 - 2 = 765763 and (3*2*3*5*7*11*13*17)/2 + 2 = 765767 are gap 4 primes, with j=3, i=7, P(i)=17.

Cf. A087820, A087822.

Sequence in context: A242189 A302756 A305216 * A204894 A109258 A088081

Adjacent sequences: A087818 A087819 A087820 * A087822 A087823 A087824

nonn,more

Pierre CAMI, Oct 06 2003

Edited by Ray Chandler, Oct 19 2003

approved