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 A070842 #10 May 01 2016 00:10:49 %S A070842 2,10,102,1020,10010,101010,1009470,11741730,223092870,6469693230 %N A070842 Smallest n-digit number with exactly n prime divisors. There are no further terms. %e A070842 a(4) = 1020 with the prime divisors 2, 3, 5, 17. %Y A070842 Cf. A001221 (omega), A002110 (primorials), A070843. %K A070842 base,nonn,fini,full %O A070842 1,1 %A A070842 _Amarnath Murthy_, May 12 2002 %E A070842 More terms from _Robert G. Wilson v_ and _Rick L. Shepherd_, May 14 2002 %E A070842 Corrected and edited by _Ray Chandler_, Feb 15 2009