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 A094427 #2 Mar 30 2012 17:27:42
%S A094427 38225,275,76725,15345,691225,480051,37947843,325211285,65042257,
%T A094427 1805570819,3477490925,17504957025,5834985675,17582877081,45778125899,
%U A094427 131914344771,43971448257,1073579479975,1579005333125,315801066625
%N A094427 Terms of A094302 which are not squarefree, without repetition.
%o A094427 (PARI) {q=1;s=Set(q);for(n=2,2000000,q=if(n>q,q*n,q/gcd(q,n)); if(setsearch(s,q)==0,s=setunion(s,Set(q));if(!issquarefree(q),print1(q,","))))}
%Y A094427 Cf. A094302, A094426.
%K A094427 nonn,easy
%O A094427 1,1
%A A094427 _Klaus Brockhaus_, May 02 2004