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 A082126 #8 Mar 11 2015 07:26:18 %S A082126 19,18,29,27,9,27,2187,6561,531441,387420489,7625597484987, %T A082126 328256967394537077627,381520424476945831628649898809, %U A082126 235655016338368235499067731945871638181119123 %N A082126 Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 19. %C A082126 Except for the first three, the members are all powers of 3. Proved by Luke Pebody, pers. comm. %o A082126 (PARI) p=19; 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 A082126 Cf. A082120, A003681 (starts with 2, 3), A082128. %K A082126 nonn %O A082126 0,1 %A A082126 _Ralf Stephan_, Apr 04 2003