id:A118664 - OEIS Search Results

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Least prime p such that n*(p#^2)-1 is prime or 0 if n is a square so no prime possible.

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2, 2, 2, 0, 2, 2, 3, 2, 0, 3, 2, 2, 3, 3, 2, 0, 2, 2, 3, 2, 2, 269, 3, 3, 0, 2, 2, 7, 5, 29, 11, 2, 2, 3, 2, 0, 11, 2, 5, 3, 2, 2, 5, 3, 2, 5, 5, 2, 0, 2, 17, 3, 2, 11, 3, 2, 2, 3, 7, 2, 7, 5, 2, 0, 3, 2, 3, 2, 5, 7, 2, 3, 5, 3, 3, 5, 2, 2, 3, 3, 0, 41, 2, 3, 7, 7, 2, 3, 3, 2, 5, 2, 3, 53, 2, 2, 3, 3, 7, 0 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`1(2^2)-1=3 prime so a(1)=2` `7(2^2)-1=27 composite` `7((23)^2)-1=251 prime so a(7)=3`
	CROSSREFS	`Sequence in context: A108352 A036476 A104994 this_sequence A118205 A130277 A109135` `Adjacent sequences: A118661 A118662 A118663 this_sequence A118665 A118666 A118667`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), May 19 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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