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 A291621 #27 Dec 21 2018 12:52:12 %S A291621 2,3,4,8,9,10,11,20,21,22,23,24,25,26,27,28,29,30,31,32,33,33,35,36, %T A291621 37,38,39,40,41,42,43,44,45,46,47,48,49,100,102,103,104,108,109,110, %U A291621 111,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,200 %N A291621 Numbers ending with a vowel in Danish. %C A291621 The sequence of words is: to, tre, fire, otte, ni, ti, elleve, tyve, enogtyve, toogtyve, treogtyve, ... %C A291621 In Danish, when pronouncing a two-digit number, the last number is mentioned first; for example, '21' is "enogtyve" ["one-and-twenty"], and '121' is "ethundredeogenogtyve" ["one-hundred-and-one-and-twenty"]. %C A291621 All numbers ending with 02, 03, 04, 08, 09, 10, 3n, 4n, n00, or n000 will end in a vowel. %C A291621 Please note that '100' can be both spelled and pronounced as "hundrede", "ethundrede", "hundred" and "ethundred"; similarly, '1000' can be spelled "tusinde", "ettusinde", "tusind" and "ettusind". The "et" in "ethundrede" is often omitted in daily speech. %H A291621 Den Danske Ordbog, <a href="http://ordnet.dk/ddo/ordbog?query=hundrede&tab=for">hundrede</a> %H A291621 Den Danske Ordbog, <a href="http://ordnet.dk/ddo/ordbog?query=tusinde">tusinde</a> %H A291621 Brady Haran and Tom Scott, <a href="https://www.youtube.com/watch?v=l4bmZ1gRqCc">58 and other Confusing Numbers</a>, Numberphile video (2015) %H A291621 Wikipedia, <a href="https://en.wikipedia.org/wiki/List_of_numbers_in_various_languages">List of numbers in various languages</a> %F A291621 All numbers ending with 02, 03, 04, 08, 09, 10, 3n, 4n, n00, n000. %Y A291621 Cf. A000861, A079741, A098060, A247751. %K A291621 nonn,easy,word %O A291621 1,1 %A A291621 _Halfdan Skjerning_, Aug 28 2017