id:A085398 - OEIS Search Results

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Let Cn(x) be the n-th cyclotomic polynomial; a(n) is the least k>1 such that Cn(k) is prime.

+0
3

3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 5, 2, 2, 2, 2, 2, 2, 6, 2, 4, 3, 2, 10, 2, 22, 2, 2, 4, 6, 2, 2, 2, 2, 2, 14, 3, 61, 2, 10, 2, 14, 2, 15, 25, 11, 2, 5, 5, 2, 6, 30, 11, 24, 7, 7, 2, 5, 7, 19, 3, 2, 2, 3, 30, 2, 9, 46, 85, 2, 3, 3, 3, 11, 16, 59, 7, 2, 2, 22, 2, 21, 61, 41, 7, 2 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(11)=5 because C11(k) is composite for k=2,3,4 and prime for k=5.`
	CROSSREFS	`Cf. A066180, A085399.` `Sequence in context: A155677 A075791 A104435 this_sequence A067438 A058758 A104223` `Adjacent sequences: A085395 A085396 A085397 this_sequence A085399 A085400 A085401`
	KEYWORD	`nonn`
	AUTHOR	`Don Reble (djr(AT)nk.ca), Jun 28 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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