OFFSET
1,2
COMMENTS
a(39) > 10^5. - Robert Price, Aug 13 2024
MATHEMATICA
Do[f=Binomial[3n, n]+1; If[PrimeQ[f], Print[n]], {n, 1, 1000}]
PROG
(PARI) is(n)=isprime(binomial(3*n, n)+1) \\ Charles R Greathouse IV, Feb 17 2017
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Alexander Adamchuk, Nov 24 2006
EXTENSIONS
a(10)-a(15) from Robert G. Wilson v, Nov 26 2006
More terms from Stefan Steinerberger, Sep 07 2007
5 more terms from Ryan Propper, Jan 01 2008
a(24)-a(31) from Robert Price, Apr 17 2019
a(32)-a(38) from Robert Price, Aug 13 2024
STATUS
approved