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%I #8 Sep 26 2014 21:13:56
%S 5,7,12,19,47,97,124,244,564,1037,12007,13662,180039
%N Indices of primes in the tetranacci sequence A001631.
%C a(14) > 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={0,0,1,0}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[4]]=sum]
%Y Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523,A214825, A235862.
%K nonn,more
%O 1,1
%A _Robert Price_, Sep 09 2014
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