A089751 - OEIS

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A089751

a(n) = the first prime in the orbit of n under f(n) = n^2 + 1, if it exists; = 0 otherwise.

2, 2, 3, 17, 5, 37, 7, 17859077 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Question: Is a(n) > 0 for all n?`
	EXAMPLE	`4 -> 4^2 + 1 = 17 (prime). So a(4) = 17.`
	CROSSREFS	`Sequence in context: A109843 A184840 A164022 * A137909 A035796 A049009` `Adjacent sequences: A089748 A089749 A089750 * A089752 A089753 A089754`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 08 2004`

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Last modified February 15 17:13 EST 2012. Contains 205828 sequences.