cp's OEIS Frontend

A168387 a(n) = the smallest number whose Spanish name contains n distinct letters of the alphabet. 2<=n<=22.

%I A168387 #4 Jun 02 2025 02:12:24
%S A168387 8,1,0,16,4,19,22,31,24,42,142,239,1042,1239,2389,10389,310589,
%T A168387 1310589,1000001310589,1000000000000000000000001000001310589,
%U A168387 1000001000000000000000000000001000001310589
%N A168387 a(n) = the smallest number whose Spanish name contains n distinct letters of the alphabet. 2<=n<=22.
%C A168387 The letters f, g, h, j, k, ss +-, and w are unused.
%C A168387 "ch" and "ll" are each one letter
%C A168387 Table of names for a(n)
%C A168387 .n..name.............................................letters used
%C A168387 .--------------------------------------------------------
%C A168387 2. Ocho...............................................o ch
%C A168387 3. Uno................................................uno
%C A168387 4. Cero...............................................cero
%C A168387 5. Dieciseis .........................................diecs
%C A168387 6. Cuatro.............................................cuatro
%C A168387 7. Diecinueve.........................................diecnuv
%C A168387 8. Veintidos..........................................veintdos
%C A168387 9. Treinta y uno......................................treinayuo
%C A168387 10. Veinticuatro.......................................veintcuaro
%C A168387 11. Cuarenta y dos.....................................cuarentydos
%C A168387 12. Ciento cuarenta y dos..............................cientouaryds
%C A168387 13. Doscientos treinta y nueve.........................doscientrayuv
%C A168387 14. Mil cuarenta y dos.................................milcuarentydos
%C A168387 15. Mil doscientos treinta y nueve.....................mildoscentrayuv
%C A168387 16. Dos mil trescientos ochenta y nueve................dosmiltrecchnayuv
%C A168387 17. Diez mil trescientos ochenta y nueve...............diezmltrscnochayuv
%C A168387 18. Trescientos diez mil quinientos ochenta y nueve....trescinodzmlquchayv
%C A168387 19. Un millon trescientos diez mil quinientos ........lltrescinodzmlquchayv
%C A168387 ....ochenta y nueve
%C A168387 20. Un billon trescientos diez mil.....................btrescinodzmlquchayv
%C A168387 ....quinientos ochenta y nueve
%C A168387 21. Un sextillon un billon trescientos ................xbtrescinodzmlquchayv
%C A168387 ....diez mil quinientos ochenta y nueve
%C A168387 22. Un septillon un sextillon un billon trescientos....pxbtrescinodzmlquchayv
%C A168387 ....diez mil quinientos ochenta y nueve
%e A168387 a(6) = 4, because "cuatro" contains six distinct letters of the alphabet.
%Y A168387 Cf. A168137 (American English version)
%K A168387 fini,full,nonn,word
%O A168387 2,1
%A A168387 _Claudio Meller_, Nov 24 2009