A143385 Least a(n) such that M(n)*(M(n)+a(n))-1 and M(n)*(M(n)+a(n))+1 are twin primes with M(i)=i-th Mersenne prime.

1, 53, 11, 17, 317, 89, 737, 2543, 1247, 6209, 15107, 33119, 60611, 671063, 2648057

Offset: 1

Author

Pierre CAMI, Aug 11 2008

Keywords

• hard
• more
• nonn

Examples

			(2^2-1)*(2^2-1+1)-1=11 prime, 11 and 13 twin primes, 2^2-1=M(1) so a(1)=1
		

Crossrefs

Cf. A139426.