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 A242316 #8 Mar 17 2016 12:54:51
%S A242316 17,103,1764391,8907752079422393063,
%T A242316 28959877095025359725108610631647478770525190687597954707985655095645523042346644747326776183477265033
%N A242316 Prime terms in the tribonacci-like sequence A214826.
%C A242316 a(6) is too large to appear here, having 124 digits. It corresponds to A214826(467).
%t A242316 a={1,4,4}; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[sum]]; a=RotateLeft[a]; a[[3]]=sum]
%t A242316 Select[LinearRecurrence[{1,1,1},{1,4,4},400],PrimeQ] (* _Harvey P. Dale_, Mar 17 2016 *)
%Y A242316 Cf. A001590, A100683, A231574, A231575, A232543, A214899, A020992, A233554. A214727, A234696, A141523, A235862,A214825, A235873 A214826, A242315.
%K A242316 nonn
%O A242316 1,1
%A A242316 _Robert Price_, May 10 2014