A098910 - OEIS

A098910

Table(n,2) read by rows giving k and j such that Mersenne-prime(k) - Mersenne-prime(j) + 1 is prime.

2, 1, 3, 1, 4, 3, 5, 3, 6, 3, 7, 3, 8, 7, 8, 6, 9, 3, 10, 3, 12, 9

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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)-(2^2-1)+1 = 29 = Mersenne-prime(3)-Mersenne-prime(1)+1 k=3 j=1 for n=2

(2^7-1)-(2^5-1)+1 = 97 = Mersenne-prime(4)-Mersenne-prime(3)+1 k=4 j=3 for n=3

and 5,29,97 are primes

CROSSREFS

KEYWORD

more,nonn,tabf

AUTHOR

Pierre CAMI, Oct 16 2004

STATUS

approved