A090886 Primes in the products of consecutive prime-indexed primes + 2 or A080696(n) + 2.

5, 17, 167, 14093057717, 16192486429745837, 114681479899746991802547357477494807, 12994174855450524638613469509299054674461271855442034674644855689971858721497

Offset: 1

Author

Cino Hilliard, Feb 12 2004

Keywords

• nonn

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

Crossrefs

Cf. A080696, A087400.

Programs

Mathematica

Select[FoldList[Times,Table[Prime[n],{n,Prime[Range[40]]}]]+2,PrimeQ] (* Harvey P. Dale, Apr 05 2019 *)

PARI

piptorial2(n) = { y=1; for(x=1,n, v=prime(prime(x)); y*=v; if(isprime(y+2),print1(y+2",")) ) }