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 A292015 #11 Nov 11 2019 12:43:03
%S A292015 3,7,5,31,3,127,17,73,11,13,8191,43,151,257,131071,524287,683,241,
%T A292015 2731,262657,331,2147483647,65537,599479,43691,174763,61681,5419,
%U A292015 2796203,4432676798593,15790321,2305843009213693951,715827883,145295143558111,10052678938039
%N A292015 Primes of the form Phi(k, 2), where Phi is the cyclotomic polynomial.
%H A292015 Robert Price, <a href="/A292015/b292015.txt">Table of n, a(n) for n = 1..89</a>
%H A292015 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>
%H A292015 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>
%F A292015 a(n) = A019320(A072226(n)). - _Max Alekseyev_, Apr 25 2018
%t A292015 Select[Table[Cyclotomic[k,2], {k, 0, 100}], PrimeQ[#] &]
%Y A292015 Cf. A072226, A019320.
%K A292015 nonn
%O A292015 1,1
%A A292015 _Robert Price_, Sep 07 2017