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 A291992 #9 Nov 11 2019 13:48:09
%S A291992 73,18837001,262657,77158673929,5302306226370307681801,
%T A291992 6113142872404227834840443898241613032969,
%U A291992 9368364192635570536820270641094526818432914571726884941545525447306194544364947298173904481801
%N A291992 Primes of the form Phi(k, -8), where Phi is the cyclotomic polynomial.
%H A291992 Robert Price, <a href="/A291992/b291992.txt">Table of n, a(n) for n = 1..9</a>
%H A291992 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>
%H A291992 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>
%t A291992 Select[Table[Cyclotomic[k,-8], {k, 3, 100}], PrimeQ[#] &]
%Y A291992 Cf. A138922.
%K A291992 nonn
%O A291992 1,1
%A A291992 _Robert Price_, Sep 07 2017