login
A370190
Numbers k such that (6^k + 6*k)/6 is prime.
2
1, 5, 7, 1003, 40513
OFFSET
1,2
COMMENTS
If it exists, a(6) > 62000.
PROG
(PARI) is(n) = ispseudoprime(6^(n-1)+n)
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Hugo Pfoertner, Feb 24 2024
STATUS
approved