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 A129739 #10 Sep 14 2017 03:56:20 %S A129739 2,3,7,23,59,8209,620297,1687054711, %T A129739 25907979805412230144914099508240296236020415269340706571266102156690578761249, %U A129739 167688864076998154482920561111926793545475633249050257599724515210137245508480818512193851652306467577687209241137 %N A129739 Primes in Somos-4 sequence (A006720). %H A129739 G. Everest et al., <a href="http://www.jstor.org/stable/27642221">Primes generated by recurrence sequences</a>, Amer. Math. Monthly, 114 (No. 5, 2007), 417-431. %Y A129739 Cf. A006720, A129740, A129741. %Y A129739 Cf. A192241, primes in Dana Scott's sequence (A048736). %K A129739 nonn %O A129739 1,1 %A A129739 _N. J. A. Sloane_, May 13 2007 %E A129739 a(9)-a(10) from _Robert G. Wilson v_, Jul 04 2007