A098819 - OEIS

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A098819

Least k such that k*(Mersenne_prime(n)^2) +1 is prime.

2, 4, 16, 12, 22, 28, 30, 22, 138, 12, 102, 180, 426, 1444, 9502, 6568, 2212, 5380, 9942, 3034, 24222, 31530 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	EXAMPLE	`2*((2^2-1)^2)+1=19 prime so a(1)=2`
	CROSSREFS	`Sequence in context: A186110 A073923 A153666 * A186008 A067846 A155893` `Adjacent sequences: A098816 A098817 A098818 * A098820 A098821 A098822`
	KEYWORD	`more,nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Oct 08 2004`
	EXTENSIONS	`a(19)-a(22) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 23 2008`

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Last modified February 17 13:11 EST 2012. Contains 206031 sequences.