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A157333 Least j such that 6*p(j)*M(n)-1 is prime with p(j)=j-th prime and M(n) = Mersenne prime 0
2, 1, 2, 1, 4, 3, 12, 31, 2, 14, 19, 15, 17, 467, 37, 111, 1382, 4830, 276, 1962, 360, 1749, 2857, 17253, 9414, 11974, 30167, 18822, 21387, 24721 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

6*3*(2^2-1)-1=53 prime 2^2-1=M(1) 3=p(2) so j(1)=2 6*2*(2^3-1)-1=83 prime 2^3-1=M(2) 2=p(1) so j(2)=1

CROSSREFS

Sequence in context: A088931 A088980 A208548 * A002852 A188440 A216327

Adjacent sequences:  A157330 A157331 A157332 * A157334 A157335 A157336

KEYWORD

nonn

AUTHOR

Pierre CAMI, Feb 27 2009

STATUS

approved

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Last modified April 23 04:43 EDT 2014. Contains 240909 sequences.