This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A234696 #8 Sep 02 2016 11:57:11
%S A234696 1,2,3,8,16,20,64,208,364,2652,7763,17280,24104,31823,70864,74008
%N A234696 Indices of primes in the tribonacci-like sequence, A214727.
%C A234696 a(17) > 2*10^5.
%H A234696 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 A234696 a={1, 2, 2}; Print[2]; Print[2]; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]
%t A234696 Position[LinearRecurrence[{1,1,1},{1,2,2},75000],_?PrimeQ]-1//Flatten (* _Harvey P. Dale_, Sep 02 2016 *)
%Y A234696 Cf. A001590, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727.
%K A234696 nonn
%O A234696 1,2
%A A234696 _Robert Price_, Dec 29 2013