Numbers m such that q = 2^m - 1 and r = m^2 + m + 1 are both primes.
A308316
Numbers m such that q = 2^m - 1 and r = m^2 + m + 1 are both primes.
Terms
- a(0) =2a(1) =3a(2) =5a(3) =17a(4) =89a(5) =9689a(6) =11213a(7) =2976221
External references
- oeis: A308316