OFFSET
1,1
COMMENTS
Corresponding values for k are 1 or 2, 3, 4, 5, 24, 64, ... Also a(7), if it exists, exceeds 6*Fibonacci(150000).
EXAMPLE
17 = 6*Fibonacci(4) - 1 = 6*3 - 1.
PROG
(PARI)
for (n=2, 1000, if (ispseudoprime (p=6*fibonacci(n)-1) && ispseudoprime (p+2), print1(p", ")))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gilbert Mozzo, Jan 12 2019
STATUS
approved