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 A269727 #8 Mar 08 2016 10:11:14 %S A269727 17,73,89,97,113,193,233,241,257,281,337,401,433,449 %N A269727 Primes avoided by certain exponential sums. %C A269727 Castro-Medina (2016) say: "At the moment of writing this manuscript, the authors did not see any pattern [to this sequence]". %H A269727 Francis N. Castro and Luis A. Medina, <a href="http://arxiv.org/abs/1603.00534">Modular periodicity of exponential sums of symmetric Boolean functions and some of its consequences</a>, arXiv:1603.00534 [math.NT], 2016. See Av(4,F(X)). %K A269727 nonn,more %O A269727 1,1 %A A269727 _N. J. A. Sloane_, Mar 08 2016