OFFSET
1,1
COMMENTS
n=31877 yields a probable prime; the others have been proved prime. These n were also found by Eric Weisstein, who found no other n<100000.
LINKS
Eric Weisstein's World of Mathematics, Central Trinomial Coefficient
Eric Weisstein's World of Mathematics, Integer Sequence Primes
MATHEMATICA
Select[Range[200], PrimeQ[Coefficient[Expand[(x^2-x-1)^# ], x, # ]]&]
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
T. D. Noe, Sep 29 2005
STATUS
approved