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A136351 Primorial numbers p# such that p# + 1 is a prime. 4
2, 6, 30, 210, 2310, 200560490130 (list; graph; refs; listen; history; text; internal format)
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

EXAMPLE

a(5)=2310 is followed by prime 2311 whereas 30030 is not followed by a prime.

CROSSREFS

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

Sequence in context: A088257 A058694 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

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Last modified October 20 17:50 EDT 2019. Contains 328268 sequences. (Running on oeis4.)