A209120 Numbers n such that (33^n - 1)/32 is prime.
3, 197, 3581, 6871, 183661
Offset: 1
Links
- H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
- H. Lifchitz, Mersenne and Fermat primes field
- Index to primes in various ranges, form ((k+1)^n-1)/k
Programs
-
Mathematica
Select[Prime[Range[100]], PrimeQ[(33^#-1)/32]&]
-
PARI
isok(n) = isprime((33^n-1)/32); \\ Michel Marcus, Mar 13 2016
Extensions
a(5) corresponds to a probable prime discovered by Paul Bourdelais, Dec 31 2018