id:A089751 - OEIS Search Results

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

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2, 2, 3, 17, 5, 37, 7, 17859077 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Question: Is a(n) > 0 for all n?`
	EXAMPLE	`4 -> 4^2 + 1 = 17 (prime). So a(4) = 17.`
	CROSSREFS	`Sequence in context: A060790 A109843 A164022 this_sequence A137909 A035796 A049009` `Adjacent sequences: A089748 A089749 A089750 this_sequence A089752 A089753 A089754`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 08 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.