id:A059324 - OEIS Search Results

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Numbers n such that 6n+5 is composite.

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3

5, 10, 12, 15, 19, 20, 23, 25, 26, 30, 33, 34, 35, 36, 40, 45, 47, 49, 50, 53, 54, 55, 56, 60, 61, 62, 65, 67, 68, 70, 72, 75, 78, 80, 82, 85, 87, 88, 89, 90, 91, 95, 96, 100, 101, 103, 104, 105, 110, 111, 114, 115, 117, 118, 120, 121, 122, 124, 125, 127, 129, 130 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Conjecture : There exists no pair of primes (p,q>p^2) such that q-p^2 = 6*n-4 (see A138479) - Philippe LALLOUET (philip.lallouet(AT)orange.fr), Mar 20 2008`
	FORMULA	`a(n) = A046953(n-1)-1`
	EXAMPLE	`a(3)=12 because 6*12+5=77 is composite.`
	CROSSREFS	`Complement of A059325.` `Cf. A138479.` `Adjacent sequences: A059321 A059322 A059323 this_sequence A059325 A059326 A059327` `Sequence in context: A033649 A050680 A098670 this_sequence A112776 A120063 A101839`
	KEYWORD	`nonn,easy`
	AUTHOR	`A. Joha (A.S.J.R.Joha(AT)student.tbm.tudelft.nl), Jan 26 2001`
	EXTENSIONS	`More terms from Henry Bottomley (se16(AT)btinternet.com), Jan 29 2001`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.

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