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 A070520 #11 Jul 05 2024 21:16:25
%S A070520 3,13,17,31,9091,20593,7027567,109912203092239643840221,
%T A070520 568972471024107865287021434301977158534824481,
%U A070520 3726767253346131780312487317315864271,19342489361037647362917398912701853907582504971824424988419390687587
%N A070520 Prime numbers of form p=Cyclotomic(n,n).
%t A070520 Do[s=Cyclotomic[n, n]; If[PrimeQ[s], Print[s]], {n, 2, 256}]; output = the prime value
%t A070520 Select[Table[Cyclotomic[n,n],{n,300}],PrimeQ] (* _Harvey P. Dale_, Dec 06 2012 *)
%Y A070520 Cf. A070518, A070519.
%K A070520 nonn
%O A070520 1,1
%A A070520 _Labos Elemer_, May 02 2002