A050933 Numbers k with property that spelling k in American English requires a new letter of the alphabet.

0, 1, 2, 3, 4, 5, 6, 8, 11, 20, 100, 1000, 1000000, 1000000000, 1000000000000000, 1000000000000000000000000, 1000000000000000000000000000

Offset

0,3

Comments

The large numbers are (new letter in uppercase): "one Billion" (10^9), "one Quadrillon" (10^15), "one sePtillion" (10^24) and "one oCtillion" (10^27). Their names and definitions are based on the American system.

Links

Table of n, a(n) for n=0..16.

Landon Curt Noll, The English name of a number

R. Rowlett, Names for large numbers

Example

Spelling "zero" requires letters "z", "e", "r", "o". Spelling "one" requires a new letter, "n". Spelling "two" requires new letters, "t" and "w"; etc. Letters "j" and "k" are never used.
"1000" (one thousand) is the smallest number that requires an "a".

Crossrefs

Sequence in context: A022468 A257664 A181324 * A103302 A173288 A134677

Adjacent sequences: A050930 A050931 A050932 * A050934 A050935 A050936

Keyword

easy,fini,full,nonn,word

Author

Jean Fontaine (jfontain(AT)odyssee.net), Dec 30 1999

Extensions

Corrected by Andrew Weimholt, Sep 27 2009

Status

approved