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 A291664 #23 Nov 20 2018 16:32:47 %S A291664 8,11,21,28,31,38,41,48,100,102,103,104,108,109,110,111,120,121,122, %T A291664 123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139, %U A291664 140,141,142,143,144,145,146,147,148,149,802,803,804,808,809,811,820,821,822,823,824,825,826 %N A291664 Numbers beginning and ending with a vowel in Danish. %C A291664 The sequence of words is: otte, elleve, enogtyve, otteogtyve, enogtredive, otteogtredive. %C A291664 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 A291664 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. %C A291664 Intersection of A291621 and A291663. - _Iain Fox_, Oct 17 2017 %H A291664 Brady Haran and Tom Scott, <a href="https://www.youtube.com/watch?v=l4bmZ1gRqCc">58 and other Confusing Numbers</a>, Numberphile video (2015) %H A291664 Wikipedia, <a href="https://en.wikipedia.org/wiki/List_of_numbers_in_various_languages">List of numbers in various languages</a> %F A291664 All numbers beginning with '1' or '8', except for two-digit numbers that do not end in '1' or '8', and that also end with 02, 03, 04, 08, 09, 10, 3n, 4n, n00, or n000 will begin and end with a vowel. %Y A291664 Cf. A000861, A079741, A098060, A247751, A291621, A291663. %K A291664 nonn,word %O A291664 1,1 %A A291664 _Halfdan Skjerning_, Aug 29 2017