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 A242315 #6 May 10 2014 23:29:58
%S A242315 4,7,23,71,379,467,596,6372,10100,11660,23099,25419,26011,36588,76895,
%T A242315 112867
%N A242315 Indices of primes in the tribonacci-like sequence A214826.
%C A242315 a(17) > 2*10^5.
%H A242315 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 A242315 a={1,4,4}; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]
%Y A242315 Cf. A001590, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523,A214825, A235862, A214826.
%K A242315 nonn
%O A242315 1,1
%A A242315 _Robert Price_, May 10 2014