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 A048530 #13 Feb 16 2025 08:32:40 %S A048530 0,600,10100,390000,1001000,100030002,100010000,10000300002, %T A048530 10000100000,1000003000002,1000001000000,100000030000002, %U A048530 100000010000000,10000000300000002,10000000100000000 %N A048530 Smallest oblong (promic) number containing exactly n 0's. %H A048530 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PronicNumber.html">Pronic Number</a> %Y A048530 Cf. A048529, A002378. %Y A048530 Cf. A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048546, A048548. %K A048530 nonn,base %O A048530 1,2 %A A048530 _Patrick De Geest_, May 15 1999