A089008 - OEIS

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A089008

Numbers n such that 18*n^2 + 1 is prime.

1, 2, 3, 7, 8, 9, 10, 11, 12, 14, 15, 22, 24, 25, 29, 31, 32, 33, 34, 35, 41, 44, 45, 51, 52, 54, 59, 62, 63, 67, 68, 73, 76, 79, 80, 85, 88, 91, 95, 99, 100, 102, 107, 108, 109, 117, 119, 120, 122, 125, 129, 131, 133, 135, 139, 141, 142, 143, 147, 150, 152, 154, 156 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Zak Seidov, Table of n, a(n) for n = 1..1000.`
	FORMULA	`a(n)=A089001(n+1)/3.`
	MATHEMATICA	`Select[Range[200], PrimeQ[18#^2+1]&] (* From Harvey P. Dale, Apr 25 2011 *)`
	CROSSREFS	`Cf. A089001, A090612, A090698.` `Sequence in context: A199966 A011027 A100072 * A047534 A118374 A154432` `Adjacent sequences: A089005 A089006 A089007 * A089009 A089010 A089011`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Dec 20 2003`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.