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a(n) is the smallest positive integer > a(n-1) with exactly n letters when written in Spanish.
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%I #28 Dec 02 2015 12:07:01

%S 1,3,5,15,30,40,50,103,105,115,130,140,150,204,214,240,250,316,317,325

%N a(n) is the smallest positive integer > a(n-1) with exactly n letters when written in Spanish.

%C a(6) = 15 = "quince" (6 letters); 4 = "cuatro" also has 6 letters but is smaller than 5 = a(5) and this sequence is strictly increasing.

%C Spaces are not counted, so, e.g., "ciento tres" and "doscientos cuatro" are treated as a 10-letter word and a 16-letter word, respectively.

%H Wikipedia, <a href="https://es.wikipedia.org/wiki/Anexo:Nombres_de_los_n%C3%BAmeros_en_espa%C3%B1ol">Anexo:Nombres de los números en español</a>

%e a( 3) = 1 for the 3-letter word "uno";

%e a( 4) = 3 for the 4-letter word "tres";

%e a( 5) = 5 for the 5-letter word "cinco";

%e a( 6) = 15 for the 6-letter word "quince";

%e a( 7) = 30 for the 7-letter word "treinta";

%e a( 8) = 40 for the 8-letter word "cuarenta";

%e a( 9) = 50 for the 9-letter word "cincuenta";

%e a(10) = 103 for the 10-letter word "cientotres";

%e ...

%e a(16) = 204 for the 16-letter word "doscientoscuatro";

%e ....

%Y Cf. A084390 (this sequence for English), A161353 (this sequence without the increasing condition).

%K nonn,word,less

%O 3,2

%A _Rodolfo Kurchan_, Jul 08 2015