a(n) is the least k such that k*Mersenne_prime(n) - 1 and k*Mersenne_prime(n) + 1 are twin primes.
A098814
a(n) is the least k such that k*Mersenne_prime(n) - 1 and k*Mersenne_prime(n) + 1 are twin primes.
Terms
- a(0) =2a(1) =6a(2) =42a(3) =144a(4) =72a(5) =312a(6) =144a(7) =234a(8) =1512a(9) =672a(10) =2226a(11) =1104a(12) =34632a(13) =267894a(14) =371634a(15) =909030a(16) =384750a(17) =3198240a(18) =2445810a(19) =1639494
External references
- oeis: A098814