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%I #25 Jan 12 2014 23:27:38
%S 4,5,7,9,25,29,49,79,1613,15205
%N Indices of prime tribonacci numbers (A001590).
%C a(11) > 2*10^5.
%o (PARI) v=[1,0,1]; for(n=4,1e4, if(ispseudoprime(t=v[1]+v[2]+v[3]), print1(n", ")); v=[v[2],v[3],t]) \\ _Charles R Greathouse IV_, Nov 18 2013
%Y Cf. A001590, A231574, A000213, A056816, A157611.
%K nonn
%O 1,1
%A _Robert Price_, Nov 18 2013
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