%I A105447
%S A105447 4,6,7,9,10,11,12,14,15,16,18,19,20,22,23,24,26,29,31,32,33,35,36,37,39,
%T A105447 42,47,50,52,53,54,56,57,58,60,63,68,76,81,84,86,87,88,90,91,92,94,97,
%U A105447 102,110,123,131,139,141,142,143,145,146,147,149,152,157
%N A105447 Positive integers whose representation as Roman Fibonacci numbers has 
               exactly two symbols.
%F A105447 a(n) is an element of A105447 iff A105446(n) = 2. a(n) is the sum or 
               difference of two Fibonacci numbers A000045 and a(n) is not itself 
               a Fibonacci number A000045.
%e A105447 In Roman Fibonacci number representation:
%e A105447 4 = "22", 6 = "33", 7 = "52", 9 = "81", 10 = "55", 11 = "83", 12 = "1A",
%e A105447 14 = "A1", 15 = "A2", 16 = "88", 18 = "3B", 19 = "2B", 20 = "1B", ...
%e A105447 143 = "1F", 145 = "F1", 146 = "F2", 147 = "F3", 149 = "F5", 152 = "F8".
%Y A105447 Cf. A000045, A006968, A105446, A105448-A105455.
%Y A105447 Sequence in context: A078744 A024555 A001690 this_sequence A144222 A010414 
               A095096
%Y A105447 Adjacent sequences: A105444 A105445 A105446 this_sequence A105448 A105449 
               A105450
%K A105447 base,easy,nonn
%O A105447 1,1
%A A105447 Jonathan Vos Post (jvospost3(AT)gmail.com), Apr 09 2005