cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

8, 1, 0, 16, 4, 19, 22, 31, 24, 42, 142, 239, 1042, 1239, 2389, 10389, 310589, 1310589, 1000001310589, 1000000000000000000000001000001310589, 1000001000000000000000000000001000001310589
Offset: 2

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Author

Claudio Meller, Nov 24 2009

Keywords

Comments

The letters f, g, h, j, k, ss +-, and w are unused.
"ch" and "ll" are each one letter
Table of names for a(n)
.n..name.............................................letters used
.--------------------------------------------------------
2. Ocho...............................................o ch
3. Uno................................................uno
4. Cero...............................................cero
5. Dieciseis .........................................diecs
6. Cuatro.............................................cuatro
7. Diecinueve.........................................diecnuv
8. Veintidos..........................................veintdos
9. Treinta y uno......................................treinayuo
10. Veinticuatro.......................................veintcuaro
11. Cuarenta y dos.....................................cuarentydos
12. Ciento cuarenta y dos..............................cientouaryds
13. Doscientos treinta y nueve.........................doscientrayuv
14. Mil cuarenta y dos.................................milcuarentydos
15. Mil doscientos treinta y nueve.....................mildoscentrayuv
16. Dos mil trescientos ochenta y nueve................dosmiltrecchnayuv
17. Diez mil trescientos ochenta y nueve...............diezmltrscnochayuv
18. Trescientos diez mil quinientos ochenta y nueve....trescinodzmlquchayv
19. Un millon trescientos diez mil quinientos ........lltrescinodzmlquchayv
....ochenta y nueve
20. Un billon trescientos diez mil.....................btrescinodzmlquchayv
....quinientos ochenta y nueve
21. Un sextillon un billon trescientos ................xbtrescinodzmlquchayv
....diez mil quinientos ochenta y nueve
22. Un septillon un sextillon un billon trescientos....pxbtrescinodzmlquchayv
....diez mil quinientos ochenta y nueve

Examples

			a(6) = 4, because "cuatro" contains six distinct letters of the alphabet.

Crossrefs

Cf. A168137 (American English version)
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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