a(n) is the least K such that K*6*M(n) - 1 and K*6*M(n) + 1 are twin primes, where M(n) = n-th Mersenne prime.

A126612

a(n) is the least K such that K*6*M(n) - 1 and K*6*M(n) + 1 are twin primes, where M(n) = n-th Mersenne prime.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =24a(4) =12a(5) =52a(6) =24a(7) =39a(8) =252a(9) =112a(10) =371a(11) =184a(12) =5772a(13) =44649a(14) =61939a(15) =151505a(16) =64125a(17) =533040a(18) =407635a(19) =273249a(20) =3901012a(21) =718187a(22) =3527063a(23) =9522163a(24) =23128315a(25) =20121642a(26) =337342290a(27) =388787370

External references