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%I #5 Jan 16 2014 15:00:34
%S 0,3,4,5,8,10,14,16,24,30,40,54,63,66,67,109,188,203,421,463,704,730,
%T 798,1155,1259,1376,1789,2095,2650,3833,4538,4794,4840,5386,8348,
%U 15176,17282,21250,21386,21825,31242,32843,33706,37026,47546,66848
%N Indices of primes in the tribonacci-like sequence, A141523.
%C a(47) > 2*10^5.
%H Tony D. Noe and Jonathan Vos Post, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL8/Noe/noe5.html">Primes in Fibonacci n-step and Lucas n-step Sequences</a>, J. of Integer Sequences, Vol. 8 (2005), Article 05.4.4
%t a={3,1,1}; Print[0]; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]
%Y Cf. A001590, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523.
%K nonn
%O 1,2
%A _Robert Price_, Jan 16 2014
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