id:A066745 - OEIS Search Results

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Least number of applications of f(k) = k(k+1)+1 to n to yield a prime, if this number exists; 0 otherwise.

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1, 0, 0, 2, 0, 1, 0, 1, 3, 2, 0, 1, 0, 1, 1 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`f(f(f(9))) = f(f(91)) = f(8373) = 70115503, a prime, whereas 9, 91, 8373 are composite; so a(9) = 3.`
	CROSSREFS	`Sequence in context: A071482 A071483 A004173 this_sequence A112517 A112519 A091728` `Adjacent sequences: A066742 A066743 A066744 this_sequence A066746 A066747 A066748`
	KEYWORD	`more,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 16 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.