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Search: id:A136352
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| A136352 |
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Primorials P for which neither P-1 nor P+1 is prime. |
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+0
5
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| 510510, 9699690, 223092870, 6469693230, 7420738134810, 13082761331670030, 614889782588491410, 32589158477190044730, 1922760350154212639070, 117288381359406970983270, 7858321551080267055879090
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This sequence is different from A121069 and A002110.
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LINKS
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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]
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FORMULA
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Compute P = product of the first k primes. If P is neither preceded nor followed by a prime add P to the sequence.
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EXAMPLE
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13# = 30030 is preceded by a prime but is not followed by a prime. 17# = 510510 is neither preceded nor followed by a prime.
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CROSSREFS
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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
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Dec 25 2007
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EXTENSIONS
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Edited by and more terms from Charles R Greathouse IV, Sep 29 2008
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