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%I #2 Mar 31 2012 14:00:43
%S 1,4,-1,1001,50,-1,19,24,31,34,44,54,119,124,131,134,144,154,231,234,
%T 244,254,354,444,454
%N a(n) = smallest number which has in its Spanish name the letter "u" in the n-th position, or -1 if no such number exists.
%C a(1)=Uno, a(2)= cUatro, a(4)= mil Uno
%K word,sign
%O 1,2
%A _Claudio Meller_, Aug 26 2009
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