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 A048548 #13 Feb 16 2025 08:32:40 %S A048548 90,992,792990,4992990,199699292,919999892,29939899992,939969999920, %T A048548 99179499990990,999690999669990,129990929999959950,299899968999993990, %U A048548 10999489909979999990,299929969229995999992,12999999959999499709890,126994909999399899999990,9399899999156999909995992 %N A048548 Smallest oblong (promic) number containing exactly n 9's. %H A048548 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PronicNumber.html">Pronic Number</a> %Y A048548 Cf. A048547, A002378. %Y A048548 Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048542, A048544, A048546. %K A048548 nonn,base %O A048548 1,1 %A A048548 _Patrick De Geest_, May 15 1999 %E A048548 a(13)-a(17) from _Giovanni Resta_, Oct 09 2019