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 A292008 #8 Nov 11 2019 18:44:48
%S A292008 3,5,17,13,257,241,65537,61681,15790321,4278255361,4562284561,
%T A292008 291280009243618888211558641,18446744069414584321,
%U A292008 78919881726271091143763623681,84179842077657862011867889681,20988936657440586486151264256610222593863921
%N A292008 Primes of the form Phi(k, 4), where Phi is the cyclotomic polynomial.
%H A292008 Robert Price, <a href="/A292008/b292008.txt">Table of n, a(n) for n = 1..18</a>
%H A292008 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/papers/cyclotomic.html">Cyclotomic polynomials and prime numbers</a>
%H A292008 <a href="/index/Cy#CyclotomicPolynomialsValuesAtX">Index entries for cyclotomic polynomials,values at X</a>
%t A292008 Select[Table[Cyclotomic[k,4], {k, 0, 100}], PrimeQ[#] &]
%Y A292008 Cf. A138934.
%K A292008 nonn
%O A292008 1,1
%A A292008 _Robert Price_, Sep 07 2017