Least number k such that (k*M(n))^2 + k*M(n) - 1 and (k*M(n))^2 + k*M(n) + 1 are twin primes where M(n) is the n-th Mersenne prime.
A121371
Least number k such that (k*M(n))^2 + k*M(n) - 1 and (k*M(n))^2 + k*M(n) + 1 are twin primes where M(n) is the n-th Mersenne prime.
Terms
- a(0) =1a(1) =3a(2) =5a(3) =8a(4) =99a(5) =275a(6) =278a(7) =404a(8) =96a(9) =1538a(10) =1253a(11) =15858a(12) =189168a(13) =119552a(14) =221444a(15) =1047122a(16) =3571449a(17) =5424924a(18) =1575995
External references
- oeis: A121371