A128657 Numbers n such that p(n+1)#-p(n)#-1 is prime where p(i)#=product of first i primes=A002110(i).

1, 2, 3, 4, 8, 24, 35, 56, 79, 132, 281, 342, 631, 1350, 4929, 5952

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Prog

(PARI) isok(n) = {my(pp=prod(k=1, n, prime(k))); isprime(pp*prime(n+1) - pp -1); } \\ Michel Marcus, Sep 20 2019

Crossrefs

Cf. A002110, A128420, A128421, A128658, A128659, A128660, A128661, A128662.

Sequence in context: A214700 A100997 A368989 * A105421 A273063 A217353

Adjacent sequences: A128654 A128655 A128656 * A128658 A128659 A128660

Keyword

nonn,more

Author

Pierre CAMI, Mar 19 2007

Status

approved