

A050933


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


2



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



