login
a(n) = smallest number which has in its Spanish name the letter "t" in the n-th position,or -1 if no such number exists.
0

%I #2 Mar 31 2012 14:00:43

%S 3,-1,14,4,20,30,23,50,17,24,53,34,44,54,117,124,153,134,144,154,253,

%T 234,244,254,354,444,454

%N a(n) = smallest number which has in its Spanish name the letter "t" in the n-th position,or -1 if no such number exists.

%C a(1)=Tres, a(3)=caTorce, a(4)=cuaTro

%K word,sign

%O 1,1

%A _Claudio Meller_, Aug 26 2009