OFFSET
1,1
COMMENTS
These numbers, except for the first one, always end in 7.
The next term (a(8)) has 129 digits. - Harvey P. Dale, Apr 05 2019
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..12
MATHEMATICA
Select[FoldList[Times, Table[Prime[n], {n, Prime[Range[40]]}]]+2, PrimeQ] (* Harvey P. Dale, Apr 05 2019 *)
PROG
(PARI) piptorial2(n) = { y=1; for(x=1, n, v=prime(prime(x)); y*=v; if(isprime(y+2), print1(y+2", ")) ) }
CROSSREFS
KEYWORD
nonn
AUTHOR
Cino Hilliard, Feb 12 2004
STATUS
approved