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 A082121 #10 Mar 11 2015 07:26:40 %S A082121 7,6,11,19,37,109,515,3301,267271,130914197,209015618081, %T A082121 887384060899271,58605404461258015758293 %N A082121 Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 7. %o A082121 (PARI) p=7; print1(p, ", "); for(n=1, 50, v=divisors(p); r=sqrt(p); t=0; for(k=1, matsize(v)[2], if(v[k]>=r, t=k; break)); if(v[t]^2==p, u=t, u=t-1); if(v[t]-v[u]<2, u=u-1; t=t+1); print1(v[t]-v[u]", "); p=p*(v[t]-v[u])) %Y A082121 Cf. A082120, A003681 (starts with 2, 3), A082122. %K A082121 nonn,hard %O A082121 0,1 %A A082121 _Ralf Stephan_, Apr 04 2003