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A002810 Smallest number containing n syllables in UK English.
(Formerly M4341 N1818)
3
1, 7, 11, 27, 77, 107, 111, 127, 177, 777, 1127, 1177, 1777, 7777, 11777, 27777, 77777, 107777, 111777, 127777, 177777, 777777, 1127777, 1177777, 1777777, 7777777, 11777777, 27777777, 77777777, 107777777, 111777777, 127777777, 177777777, 777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence uses UK English as opposed to US English. a(6) = 107 since "one hundred and seven" has six syllables. - N. J. A. Sloane, Nov 24 2009

Because of this convention, we do not have A075774(a(n))=n, since A075774 uses US English, i.e., without the "trailing 'and'". All terms from a(6)=107 on will have this 'and', therefore A075774(a(n)) = n-1 for 5 < n < 18. From a(18)=107777 on, there is a second 'and', etc. See A045736 for the "American English" version, see A001167 for the analog considering the number of words. - M. F. Hasler, Nov 03 2013

REFERENCES

Rodolfo Kurchan, Mesmerizing Math Puzzles, by Sterling Publications, p. 18.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

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

LINKS

Table of n, a(n) for n=1..34.

Robert G. Wilson v, English names for the numbers from 0 to 11159 without spaces or hyphens.

Wiktionary, one hundred one (US)

Wiktionary, one hundred and one (UK)

Index to OEIS: sequences related to English words for n

FORMULA

a(n+12) = a(n)*1000+777, as long as a(n+12) is less than one quadrillion (whatever scale is used). - M. F. Hasler, Nov 03 2013

EXAMPLE

"One" has one syllable, therefore a(1)=1; a(2)=7 since "seven" is the least number to have two syllables; a(3)=11 because eleven is the first to have 3 syllables.

PROG

(PARI) A002810(n)={if(n>12, A002810(n-4*n=(n-1)\12*3)*10^n+10^n\9*7, [1, 7, 11, 27, 77, 107, 111, 127, 177, 777, 1127, 1177][n])} \\ Valid up to a(58) (or a(84) when long scale is used). - M. F. Hasler, Nov 03 2013

CROSSREFS

Cf. A045736.

Sequence in context: A276504 A039287 A045222 * A045736 A158807 A067006

Adjacent sequences:  A002807 A002808 A002809 * A002811 A002812 A002813

KEYWORD

word,nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Edited and extended by M. F. Hasler, Nov 03 2013

STATUS

approved

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Last modified January 19 16:32 EST 2019. Contains 319309 sequences. (Running on oeis4.)