OFFSET
1,1
PROG
(Magma) [n: n in [0..500]|IsPrime(7^n-5^n-1)];
(PARI) for(n=1, 10000, if(isprime(7^n-5^n-1), print1(n, ", "))); /* Joerg Arndt, May 15 2011 */
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Vincenzo Librandi, Jan 22 2011
EXTENSIONS
a(9)-a(12) from Michael S. Branicky, May 08 2021
a(13)-a(14) from Michael S. Branicky, May 14 2023
a(15)-a(16) from Michael S. Branicky, Oct 27 2024
STATUS
approved