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A050933 Numbers n with property that spelling n 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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 21 15:13 EDT 2017. Contains 292300 sequences.