A007005 Number of characters in the French spelling of n, including spaces and hyphens.

4, 2, 4, 5, 6, 4, 3, 4, 4, 4, 3, 4, 5, 6, 8, 6, 5, 8, 8, 8, 5, 11, 10, 11, 12, 10, 9, 10, 10, 10, 6, 12, 11, 12, 13, 11, 10, 11, 11, 11, 8, 14, 13, 14, 15, 13, 12, 13, 13, 13, 9, 15, 14, 15, 16, 14, 13, 14, 14, 14, 8, 14, 13, 14, 15, 13, 12, 13, 13, 13, 12, 16, 14, 15, 17, 15, 14

Offset: 0

Author

Simon Plouffe

Keywords

• nonn
• word
• easy
• nice

Comments

This sequence gives the number of characters, including spaces and hyphens, in the French spelling of the numbers; e.g., a(21) = 11 = #"vingt et un", a(22) = 10 = #"vingt-deux". - M. F. Hasler, Nov 18 2009

See A167507 for a variant where only letters are counted, but spaces and hyphens are not counted. - M. F. Hasler, Jun 03 2012

See A052360 for the English version (and A005589 for the letters-only variant); A007208 for the German version. - M. F. Hasler, Sep 20 2014

This refers to the official French spelling, Swiss or Belgian variants ("septante", ...) are not considered here. - M. F. Hasler, Sep 21 2014

Examples

			a(0) = 4 = #"zéro"
a(80) = 13 = #"quatre-vingts"
a(999) = 31 = #"neuf cent quatre-vingt-dix-neuf"
a(1000) = 5 = # "mille"
		

References

• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• M. F. Hasler, Table of n, a(n) for n = 0..1000
• Wiktionnaire, Annexe:Nombres de 1 à 100 en français. [From _M. F. Hasler_, Nov 18 2009]
• Index entries for sequences related to number of letters in n

Crossrefs

Cf. A005589, A007208, A052360, A167507.

Programs

PARI

A007005(n)=#French(n)   /* cf. A167507 for PARI code of "French()" - M. F. Hasler, Jun 03 2012 */

Extensions

a(71) and a(74) corrected by M. F. Hasler, Jun 03 2012

Example completed by Rémy Sigrist, Sep 09 2018