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A121305
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Value of Roman numeral embedded in English name of n, or 0 if no such value exists.
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2
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0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 0, 55, 55, 1, 0, 1, 9, 5, 1, 1, 0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 0, 0, 0, 0, 0, 4, 9, 5, 1, 1, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 0, 0, 0, 6, 6, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 1, 1, 1, 1, 1, 0, 0, 4, 2, 2, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Not well-defined! A002904 is the main entry for this sequence. - N. J. A. Sloane, Sep 28 2011.
There are a finite number of nonzero values because "hunDreD" and "mILLIon" and "bILLIon" and "trILLIon" and so forth yield non-well-formed Roman numerals. The largest n such that a(n) is nonzero is 94044 maps to "nInetyfour thousanD fortyfour" maps to "ID" maps to 499.
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REFERENCES
| 5.
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FORMULA
| Take English name of n as string of characters, eliminate all spaces, hyphens and letters other than I, V, X, L, C, D, M. Interpret remaining string as a Roman numeral, assigning 0 if the string is not well-formed and a(n) is well-formed.
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EXAMPLE
| a(5) = 4 because 5 maps to "five" maps to "fIVe" maps to "IV" maps to 4.
a(6) = 9 because 6 maps to "six" maps to "sIX" maps to "IX" maps to 9.
a(7) = 5 because 7 maps to "seven" maps to "seVen" maps to "V" maps to 5.
a(8) = 1 because 8 maps to "eight" maps to "eIght" maps to "I" maps to 1.
a(9) = 1 because 9 maps to "nine" maps to "nIne" maps to "I" maps to 1.
a(35) = 0 because 35 maps to "thirty-five" maps to "thIrty-fIVe" maps to "IIV" which is not a well-formed Roman nhumeral, hence maps to 0.
a(1000) = 500 because 1000 maps to "one thousand" maps to "one thousanD" maps to "D" maps to 500.
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CROSSREFS
| Cf. A002904, A005589.
Sequence in context: A200629 A021206 A002904 * A200396 A011513 A164818
Adjacent sequences: A121302 A121303 A121304 * A121306 A121307 A121308
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KEYWORD
| base,easy,nonn,word
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 05 2006
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