id:A103777 - OEIS Search Results

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Numbers n such that f[n],f[n+1]and f[n+2] are all primes, where f[n]=8*n^2+4*n+1.

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15, 50, 80, 110, 230, 245, 425, 570, 635, 645, 710, 925, 1440, 1645, 1710, 1815, 2000, 2465, 2635, 2940, 3040, 3090, 3195, 3525, 4260, 4310, 4400, 4885, 5960, 6145, 7030, 7120, 7250, 8430, 8890, 9445, 10265, 11060, 11150, 11710, 11775, 13020, 13565 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`All terms are divisible by 5, hence conjecture: there is no such n that f[n],f[n+1],f[n+2] and f[n+3] are primes.`
	EXAMPLE	`15 is a term because f[15]=1861, f[16]=2113, and f[17]=2381 are all primes.`
	CROSSREFS	`Cf. A102083, A103776.` `Adjacent sequences: A103774 A103775 A103776 this_sequence A103778 A103779 A103780` `Sequence in context: A000813 A065906 A020257 this_sequence A134742 A029941 A075928`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Feb 15 2005`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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