Least odd prime a(n) such that (a(n)*M(n))^2 + a(n)*M(n) - 1 is prime with M(n) = Mersenne-primes (A000043).
A107709
Least odd prime a(n) such that (a(n)*M(n))^2 + a(n)*M(n) - 1 is prime with M(n) = Mersenne-primes (A000043).
Terms
- a(0) =3a(1) =3a(2) =3a(3) =7a(4) =43a(5) =19a(6) =13a(7) =5a(8) =571a(9) =3a(10) =137a(11) =59a(12) =3823a(13) =2707a(14) =6277a(15) =1063a(16) =4523a(17) =631a(18) =8209a(19) =34537a(20) =102329a(21) =46399a(22) =30323a(23) =18803a(24) =1063a(25) =21019
External references
- oeis: A107709