Smallest number k such that M(n)^2-k*M(n)+1 is prime with M(n)= Mersenne primes =A000668(n).
A139425
Smallest number k such that M(n)^2-k*M(n)+1 is prime with M(n)= Mersenne primes =A000668(n).
Terms
- a(0) =1a(1) =1a(2) =9a(3) =3a(4) =3a(5) =25a(6) =7a(7) =21a(8) =435a(9) =241a(10) =3a(11) =153a(12) =151a(13) =493a(14) =537a(15) =2871a(16) =1713a(17) =4941a(18) =4963a(19) =307a(20) =28413a(21) =5035a(22) =1615a(23) =43525a(24) =9973
External references
- oeis: A139425