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A136351
Primorial numbers p# such that p# + 1 is a prime.
5
2, 6, 30, 210, 2310, 200560490130
OFFSET
1,1
COMMENTS
This sequence is different from A121069 and A002110.
a(7)=A002110(75) has 154 digits and is too long to be listed. - R. J. Mathar, Jul 23 2008
LINKS
FORMULA
{A002110(j): A002110(j)+1 in A000040}. - R. J. Mathar, Jul 23 2008
a(n) = A002110(A014545(n+1)). - Michel Marcus, Apr 05 2021
EXAMPLE
a(5)=2310 is followed by prime 2311 whereas 30030 is not followed by a prime.
PROG
(PARI)
S=[]; for(n=1, 200, k=vecprod(primes(n)); if(isprime(k+1), S=concat(S, k))); print(S) \\ Miles Englezou, Oct 28 2024
CROSSREFS
KEYWORD
easy,nonn,changed
AUTHOR
Enoch Haga, Dec 25 2007
EXTENSIONS
Changed a(1) from 4 to 2 and edited by R. J. Mathar, Jul 23 2008
STATUS
approved