id:A062505 - OEIS Search Results

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If p = prime divides n, then either p+2 or p-2 is prime.

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1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 25, 27, 29, 31, 33, 35, 39, 41, 43, 45, 49, 51, 55, 57, 59, 61, 63, 65, 71, 73, 75, 77, 81, 85, 87, 91, 93, 95, 99, 101, 103, 105, 107, 109, 117, 119, 121, 123, 125, 129, 133, 135, 137, 139, 143, 145, 147, 149, 151, 153, 155, 165 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Multiplicative closure of twin primes (A001097).`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`35 is included because 35 = 57 and both (5+2) and (7-2) are primes.` `65=513 where the factors are members of twin prime pairs: (3,5) and (11,13), therefore a(29)=65 is a term; but 69 is not because 69=3*23 and 23=A007510(2) is a single prime.`
	CROSSREFS	`Range of A072963. Cf. A074480.` `Sequence in context: A082720 A033037 A158333 this_sequence A093031 A143452 A138217` `Adjacent sequences: A062502 A062503 A062504 this_sequence A062506 A062507 A062508`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Jul 09 2001`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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