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a(n) the smallest number whose name in Spanish has the letter N in the n-th position starting from the end.
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%I #15 May 07 2020 05:41:03

%S 100,1,5,100000,9,22,23,25,24,34,51,53,55,54

%N a(n) the smallest number whose name in Spanish has the letter N in the n-th position starting from the end.

%D Bulletin Los Acertijeros 77, June 1996, problem 608 by Rodolfo Kurchan.

%e a(1) = 100 because "cieN" has an N as its last letter (i.e., 1st, counting from the end) and is the smallest such number;

%e a(2) = 1 because 1 is the smallest number whose name in Spanish ("uNo") has an N as its next-to-last letter (i.e., 2nd, counting from the end);

%e Similarly, a(3) = 5 ("ciNco"), a(4) = 100000 ("cieNmil"), and a(5) = 9 ("Nueve").

%K nonn,word,more

%O 1,1

%A _Rodolfo Kurchan_, Feb 11 2010

%E Edited by _Jon E. Schoenfield_, Oct 06 2018

%E a(9)-a(14) from _Alvin Hoover Belt_, May 05 2020