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 A062726 #10 Apr 07 2023 09:26:46 %S A062726 1,4,5,6,9,10,11,14,15,16,40,41,44,45,46,50,51,54,55,56,59,60,61,64, %T A062726 65,66,90,91,94,95,96,100,101,104,105,106,109,110,111,114,115,116,140, %U A062726 141,144,145,146,150,151,154,155,156,159,160,161,164,165,166,400,401,404 %N A062726 Numbers that do not contain repeated letters when written in Roman numerals. %H A062726 Sean A. Irvine, <a href="/A062726/b062726.txt">Table of n, a(n) for n = 1..316</a> %H A062726 P. Lewis, <a href="http://www.web40571.clarahost.co.uk/roman/front.htm">Roman numerals and calendar</a> %e A062726 9 is OK because when written in Roman numerals it is IX and has no letter repeated. %e A062726 The largest possible term is a(316) = 1666 = MDCLXVI. - _Sean A. Irvine_, Apr 07 2023 %Y A062726 Cf. A006968. %K A062726 nonn,base,fini,full %O A062726 1,2 %A A062726 _Rodolfo Kurchan_, Jul 11 2001 %E A062726 Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jul 23 2001