A136351 Primorial numbers p# such that p# + 1 is a prime.

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

Table of n, a(n) for n=1..6.

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.

Crossrefs

Cf. A002110, A014545, A121069, A136349, A136350, A136352.

Sequence in context: A058694 A336672 A046853 * A071290 A185693 A093449

Adjacent sequences: A136348 A136349 A136350 * A136352 A136353 A136354

Keyword

easy,nonn

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