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 A292013 #8 Nov 11 2019 13:56:42
%S A292013 73,6481,530713,42521761,47763361,282429005041,150094634909578633,
%T A292013 13490012358249728401,
%U A292013 19966781110160346782368664772328944885905284750420567849,1076050302914923449767311155851656076154481
%N A292013 Primes of the form Phi(k, 9), where Phi is the cyclotomic polynomial.
%H A292013 Robert Price, <a href="/A292013/b292013.txt">Table of n, a(n) for n = 1..12</a>
%H A292013 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>
%H A292013 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>
%t A292013 Select[Table[Cyclotomic[k,9], {k, 0, 100}], PrimeQ[#] &]
%Y A292013 Cf. A138939.
%K A292013 nonn
%O A292013 1,1
%A A292013 _Robert Price_, Sep 07 2017