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 A307973 #18 Jul 15 2019 20:00:00 %S A307973 1,8,18,19,21,28,29,31,38,39,41,48,49,51,58,59,61,68,69,71,78,79,80, %T A307973 81,88,91,98,100,101,102,103,104,105,106,107,108,109,110,111,112,113, %U A307973 114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130 %N A307973 Numbers beginning with a vowel in Hindi. %C A307973 For 99 < n < 1000, n belongs to the list if (floor(n/100) mod 10) belongs to the list (i.e., is either 1 or 8). %C A307973 For 10^(2k+1)-1 < n < 10^(2k+3), where k is a positive integer, n belongs to the list if (floor(n/(10^(2k+1))) mod 100) belongs to the list. %H A307973 Author?, <a href="http://www.hindi.co/ginatee/numbers_saNkhyaaENn.html">Hindi Numbers</a> %H A307973 <a href="/index/Na">Index entries for sequences related to names of numbers</a> %Y A307973 Cf. A000852. %K A307973 easy,nonn,word %O A307973 1,2 %A A307973 _Sangeet Paul_, May 30 2019