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 A070530 #4 Oct 15 2013 22:31:19
%S A070530 5,73,257,4432676798593
%N A070530 Primes of form Cyclotomic[n,2^n].
%e A070530 4th term is Cyclotomic[7,128]=1+128+16384+2097152+..+4398046511104=4432676798593; the next 2 known terms have almost 200 or more than 1000 decimal digits.
%t A070530 Do[s=Cyclotomic[n, 2^n]; If[PrimeQ[s], Print[s]], {n, 1, 59}]
%Y A070530 Cf. A070518-A070527.
%K A070530 nonn
%O A070530 1,1
%A A070530 _Labos Elemer_, May 02 2002