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A098911 Table(n,2) read by rows giving k and j such that Mersenne-prime(k) - Mersenne-prime(j) - 1 is prime. 0
2, 1, 3, 2, 6, 2, 9, 6, 9, 7, 10, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

(2^3-1)-(2^2-1)-1 = 5 = Mersenne-prime(2)-Mersenne-prime(1)-1 k=2 j=1 for n=1

(2^5-1)-(2^3-1)-1 = 23 = Mersenne-prime(3)-Mersenne-prime(2)-1 k=3 j=2 for n=2

(2^17-1)-(2^3-1)-1 = 131063 = Mersenne-prime(6)-Mersenne-prime(2)-1 k=6 j=2 for n=3

and 3,23,131063 are primes

CROSSREFS

Sequence in context: A071690 A114653 A069481 * A052305 A165045 A164768

Adjacent sequences:  A098908 A098909 A098910 * A098912 A098913 A098914

KEYWORD

more,nonn,tabf

AUTHOR

Pierre CAMI, Oct 16 2004

STATUS

approved

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Last modified December 17 22:43 EST 2014. Contains 252040 sequences.