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 A059916 #24 Apr 21 2023 11:37:54
%S A059916 0,1,2,4,5,6,8,10,40,46,60,61,64,80,84,5000
%N A059916 Nonnegative integers that when written out in full in English have no repeated letter.
%C A059916 If negative numbers are allowed then there are two more terms, namely -40 and -2. - _Paul Duckett_, Jun 05 2022
%D A059916 GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 70.
%H A059916 Jeff Miller, <a href="https://jeff560.tripod.com/words15.html">A Collection of Word Oddities and Trivia</a>
%o A059916 (Python)
%o A059916 from num2words import num2words as n2w
%o A059916 def letters(n):
%o A059916 return "".join(c for c in n2w(n).replace(" and", "") if c.isalpha())
%o A059916 def ok(n):
%o A059916 w = letters(n)
%o A059916 return len(w) == len(set(w))
%o A059916 print([k for k in range(5001) if ok(k)]) # _Michael S. Branicky_, May 04 2022
%K A059916 fini,full,nonn,word
%O A059916 1,3
%A A059916 _Rodolfo Kurchan_, Mar 11 2001
%E A059916 More terms from George Russell (ger(AT)tzi.de), Nov 10 2004
%E A059916 Edited by _N. J. A. Sloane_, May 29 2006