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 A292011 #8 Nov 11 2019 13:56:21
%S A292011 2801,43,16148168401,117307,11898664849,13564461457,6568801,
%T A292011 29078814248401,13841169553,3421093417510114543,33232924804801,
%U A292011 79787519018560501,1628413557556843,5457586804596062091175455674392801,402488219476647465854701
%N A292011 Primes of the form Phi(k, 7), where Phi is the cyclotomic polynomial.
%H A292011 Robert Price, <a href="/A292011/b292011.txt">Table of n, a(n) for n = 1..25</a>
%H A292011 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>
%H A292011 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>
%t A292011 Select[Table[Cyclotomic[k,7], {k, 0, 100}], PrimeQ[#] &]
%Y A292011 Cf. A138937.
%K A292011 nonn
%O A292011 1,1
%A A292011 _Robert Price_, Sep 07 2017