A136350 Primorial numbers #p such that (#p)-1 is composite.

210, 510510, 9699690, 223092870, 6469693230, 200560490130, 7420738134810, 13082761331670030, 614889782588491410, 32589158477190044730, 1922760350154212639070, 117288381359406970983270

Offset: 1

Author

Enoch Haga, Dec 25 2007

Keywords

• easy
• nonn

Comments

This sequence is different from A121069 and A002110.

Examples

			a(1)=210 because 209=A002110(4)-1 is not prime.
		

Crossrefs

Cf. A136349, A136351, A136352, A002110, A121069.

Programs

Mathematica

Select[FoldList[Times, 1, Prime[Range[18]]],CompositeQ[#-1]&] (* James C. McMahon, May 08 2025 *)

Formula

{A002110(j): A002110(j)-1 in A002808}. - R. J. Mathar, Jul 23 2008

Extensions

Edited and extended by R. J. Mathar, Jul 23 2008