id:A098765 - OEIS Search Results

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a(n) = least k such that (k*P(n)#)^2 + 1 ((k+1)*P(n)#)^2 + 1 and ((k+2)*P(n)#)^2 + 1 are 3 primes with P(i) = i-th prime, P(i)# = i-th primorial.

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1, 34, 3, 252, 16, 104, 246, 562, 895, 459, 3656, 165, 409, 869, 3075, 1568, 1310, 7723, 4035, 21114, 10634, 2185, 143, 11861, 24850, 3168, 4750, 14373, 565, 22576, 7971, 2063, 17528, 58449 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`(3235)^2+1=8101 prime` `(4235)^2+1=14401 prime` `(523*5)^2+1=22501 prime` `so a(3)=3`
	CROSSREFS	`Adjacent sequences: A098762 A098763 A098764 this_sequence A098766 A098767 A098768` `Sequence in context: A022070 A123301 A037933 this_sequence A071788 A118497 A033354`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Oct 02 2004`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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