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 A247028 #8 Sep 26 2014 21:14:19
%S A247028 2,7,193,19079,1823013184807,324494495853101147203936847,
%T A247028 16085434555484907108254435283952049,
%U A247028 255525859571903290673264616283734506003204622439226993660213169027169
%N A247028 Primes in tetranacci sequence A001631.
%C A247028 a(9) is too large to display here. It has 160 digits and is the 564th term in A001631.
%t A247028 a={0,0,1,0}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[sum]]; a=RotateLeft[a]; a[[4]]=sum]
%Y A247028 Cf. A001590, A001631, A100683, A231574, A231575, A232543, A214899, A020992, A233554. A214727, A234696, A141523, A235862,A214825, A235873, A001630, A241660, A247027.
%K A247028 nonn
%O A247028 1,1
%A A247028 _Robert Price_, Sep 09 2014