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 A093788 #5 Jul 25 2016 10:11:00
%S A093788 1,11,111,15,5,51,511,5111,110,10,101,1011,10111,1015,105,1051,10511,
%T A093788 105111,10110,1010,10101,101011,1010111,101015,10105,101051,1010511,
%U A093788 10105111,1010110,101010,1010101,10101011,101010111,10101015,1010105
%N A093788 The Roman numerals, with "i" replaced by "1", "v" replaced by "5", "x" replaced by 10, etc.
%C A093788 A more compact and easier to parse version is A061493, where I, V, X, L, ... are replaced by 1, 2, 3, 4, ... The terms of this sequence can be converted to those of A061493 by changing digits '5' to '2' and deleting each digit '0' upon increasing by 2 the nonzero digit to its left. - _M. F. Hasler_, Jul 25 2016
%o A093788 (PARI) {A093788(n)=A061493(n,,[1000, 1000, 900, 1001000, 500, 500, 400, 100500, 100, 100, 90, 10100, 50, 50, 40, 1050, 10, 10, 9, 110, 5, 5, 4, 15, 1, 1])} \\ _M. F. Hasler_, Jul 25 2016
%Y A093788 Cf. A006968, A002963, A003587, A036787, A057226.
%Y A093788 Cf. A036746, A036786, A036788, A160676, A160677, A199921.
%K A093788 base,easy,nonn
%O A093788 1,2
%A A093788 William J. Rapaport (rapaport(AT)buffalo.edu), May 17 2004
%E A093788 Cross-references added and data double-checked by _M. F. Hasler_, Jul 25 2016