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 A006598 M3098 #22 Sep 13 2019 20:43:59
%S A006598 1,3,23,36,39,56,75,83,119,120,176,183,228,683,1520
%N A006598 Numbers n such that 2^(2n+1) - 2^(n+1) + 1 is a prime.
%C A006598 These numbers satisfy A100014(n)=2. - _Michel Marcus_, Mar 07 2013
%D A006598 J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
%D A006598 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006598 J. Brillhart et al., <a href="http://dx.doi.org/10.1090/conm/022">Factorizations of b^n +- 1</a>, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
%H A006598 S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/cun/index.html">The Cunningham Project</a>
%t A006598 Do[ If[ PrimeQ[ 2^(2n + 1) - 2^(n + 1) + 1 ], Print[n] ], {n, 1, 4000} ]
%Y A006598 Cf. A007670.
%Y A006598 Indices of primes in A092440. For the actual primes see A325914.
%K A006598 nonn
%O A006598 1,2
%A A006598 _N. J. A. Sloane_, _Robert G. Wilson v_