id:A108656 - OEIS Search Results

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Least a(n)>0 such that a(n-2)*n^2+a(n-1)*n+a(n) is a prime.

+0
2

2, 3, 2, 3, 2, 7, 2, 3, 2, 11, 4, 5, 2, 1, 2, 5, 10, 1, 2, 3, 2, 3, 2, 1, 2, 5, 4, 17, 6, 13, 4, 1, 2, 5, 8, 11, 10, 3, 2, 9, 2, 11, 6, 3, 4, 15, 6, 1, 6, 1, 4, 5, 2, 11, 4, 1, 10, 3, 36, 7, 16, 1, 10, 15, 12, 5, 14, 5, 4, 1, 14, 5, 40, 1, 2, 11, 8, 11, 24, 17, 2, 1, 12, 5, 8, 23, 10, 29, 8, 1, 4, 5 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Corresponding primes in A108657.`
	EXAMPLE	`a(1)=2, a(2)=3 and a(3)=2 because 23^2+33+2=29 is aprime; a(4)=3, a(5)=2 and a(6)=7 because 36^2+26+7=127 is a prime.`
	MATHEMATICA	`a=2; b=3; s={a, b}; Do[c=Prime[PrimePi[an^2+bn]+1]-an^2-bn; AppendTo[s, c]; a=b; b=c, {n, 3, 200}]; A108656=s`
	CROSSREFS	`Cf. A108657.` `Sequence in context: A087317 A086489 A015886 this_sequence A164962 A119880 A075019` `Adjacent sequences: A108653 A108654 A108655 this_sequence A108657 A108658 A108659`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jun 14 2005`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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