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A136352 Primorials P for which neither P-1 nor P+1 is prime. +0
5
510510, 9699690, 223092870, 6469693230, 7420738134810, 13082761331670030, 614889782588491410, 32589158477190044730, 1922760350154212639070, 117288381359406970983270, 7858321551080267055879090 (list; graph; listen)
OFFSET

1,1

COMMENT

This sequence is different from A121069 and A002110.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n=1..350 [From Charles R Greathouse IV, Sep 29 2008]

Charles R Greathouse IV, Home Page [in lieu of email address]

FORMULA

Compute P = product of the first k primes. If P is neither preceded nor followed by a prime add P to the sequence.

EXAMPLE

13# = 30030 is preceded by a prime but is not followed by a prime. 17# = 510510 is neither preceded nor followed by a prime.

CROSSREFS

Cf. A136349 A136350 A136351 A002110 A121069.

Adjacent sequences: A136349 A136350 A136351 this_sequence A136353 A136354 A136355

Sequence in context: A123321 A147574 A046325 this_sequence A138207 A068816 A110971

KEYWORD

easy,nonn

AUTHOR

Enoch Haga (Enokh(AT)comcast.net), Dec 25 2007

EXTENSIONS

Edited by and more terms from Charles R Greathouse IV, Sep 29 2008

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Last modified January 7 17:35 EST 2009. Contains 152824 sequences.


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