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a(n) = smallest number which has in its Spanish name the letter "n" in the n-th position.
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%I #9 Oct 07 2018 03:27:41

%S 9,1,5,15,30,19,29,21,25,31,35,45,55,121,125,131,135,145,155,231,235,

%T 245,255,355,445,455

%N a(n) = smallest number which has in its Spanish name the letter "n" in the n-th position.

%D Rodolfo Kurchan, Bulletin 75, "Los acertijeros", February 1996. [From _Claudio Meller_, Feb 12 2010]

%e a(1) = 9 ("Nueve");

%e a(2) = 1 ("uNo");

%e a(3) = 5 ("ciNco");

%e a(4) = 15 ("quiNce").

%K nonn,word,more

%O 1,1

%A _Claudio Meller_, Aug 26 2009