OFFSET
1,2
COMMENTS
Williams primes to base 12.
LINKS
Steven Harvey, Williams primes
H. C. Williams, The primality of certain integers of the form 2Ar^n - 1, Acta Arith. 39 (1981), 7-17.
MATHEMATICA
Select[Range[0, 10000], PrimeQ[12*13^n-1] &]
PROG
(PARI) for(n=0, 10000, if(isprime(12*13^n-1), print1(n, ", ")))
(Magma) [n: n in [0..10000] |IsPrime(12*13^n-1)];
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Tim Johannes Ohrtmann, Feb 15 2018
EXTENSIONS
a(16) from Michael S. Branicky, Sep 14 2022
a(17) from Michael S. Branicky, Nov 12 2024
STATUS
approved