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 A247561 #20 Dec 20 2016 10:51:44
%S A247561 5,6,10,11,12,13,18,30,31,36,38,97,108,150,196,221,277,532,596,2468,
%T A247561 2691,3773,4303,5755,8925,10083,11708,14080,19990,24102,34767,35973,
%U A247561 39238,49760,97706
%N A247561 Indices of primes in the tetranacci sequence A000288.
%C A247561 a(36) > 2*10^5.
%H A247561 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 A247561 a={1,1,1,1}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[4]]=sum]
%t A247561 Flatten[Position[LinearRecurrence[{1,1,1,1},{1,1,1,1},10^5], _?PrimeQ]]- 1 (* _Harvey P. Dale_, Dec 20 2016 *)
%Y A247561 Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523, A214825, A235862, A000288.
%K A247561 nonn,more
%O A247561 1,1
%A A247561 _Robert Price_, Sep 27 2014