id:A136352 - OEIS Search Results

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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` `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.` `Sequence in context: A123321 A147574 A046325 this_sequence A138207 A068816 A087096` `Adjacent sequences: A136349 A136350 A136351 this_sequence A136353 A136354 A136355`
	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 November 25 13:47 EST 2009. Contains 167481 sequences.

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