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A090886 Primes in the products of consecutive prime-indexed primes + 2 or A080696(n) + 2. 0
5, 17, 167, 14093057717, 16192486429745837, 114681479899746991802547357477494807, 12994174855450524638613469509299054674461271855442034674644855689971858721497 (list; graph; refs; listen; history; text; internal format)
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

Table of n, a(n) for n=1..7.

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

Sequence in context: A286307 A119769 A182066 * A097490 A309178 A164740

Adjacent sequences:  A090883 A090884 A090885 * A090887 A090888 A090889

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Feb 12 2004

STATUS

approved

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Last modified April 20 20:26 EDT 2021. Contains 343137 sequences. (Running on oeis4.)