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 A105449 #3 Mar 30 2012 18:40:28 %S A105449 80,106,114,116,117,119,120,121,122,127,129,130,135,137,138 %N A105449 Positive integers whose representation as Roman Fibonacci numbers has exactly four symbols. %C A105449 A105446 gives the number of symbols in Roman Fibonacci numbers. A105447 gives positive integers whose representation as Roman Fibonacci numbers has exactly two symbols. A105448 gives positive integers whose representation as Roman Fibonacci numbers has exactly three symbols. A105450 gives positive integers whose representation as Roman Fibonacci numbers has exactly five symbols. %F A105449 a(n) is an element of A105449 iff A105446(n) = 4. %e A105449 In Roman Fibonacci number representation: %e A105449 80 = "DB22", 106 = "EA22", 114 = "DD22", 116 = "DD33", 117 = "DD52", 119 = "DD81", 120 = "DD55", 121 = "DD2A", 122 = "DD1A", 127 = "BF22", 129 = "BF33", 130 = "BF52", 135 = "AF22", 137 = "AF33", 138 = "AF52". %Y A105449 Cf. A000045, A006968, A105446-A105448, A105450-A105455. %K A105449 base,easy,nonn %O A105449 1,1 %A A105449 _Jonathan Vos Post_, Apr 09 2005