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A002810 Smallest number containing n syllables in UK English.
(Formerly M4341 N1818)
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)



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

From Bernard Schott, Feb 18 2019: (Start)

a(19) = 111777 is precisely the number used for Berry's paradox. The name in UK English of the number 111777 requires 19 syllables because its name is: "One hundred and eleven thousand seven hundred and seventy-seven" and it's exactly the smallest number containing 19 syllables in UK English.

The paradox occurs when we know that this integer is "the least integer not nameable in fewer than nineteen syllables" but, however, 111777 has just been now defined in eighteen syllables with this last sentence. So, there is a contradiction, because the smallest integer expressible in nineteen syllables can be expressed in eighteen syllables. This contradiction is Berry's paradox. (End)


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

R. C. Penner, Discrete Mathematics, Proofs Techniques and Mathematical Structures, World Scientific, 1999, Reprinted 2001, p. 97.

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).

David Wells, The Penguin Dictionary of Curious and Interesting Numbers, Penguin Books, Revised edition, 1997, p. 171.


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

Eric Weisstein's World of Mathematics, Berry Paradox

Wiktionary, one hundred one (US)

Wiktionary, one hundred and one (UK)

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

Index to OEIS: sequences related to English words for n


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


"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.


(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


Cf. A045736.

Sequence in context: A276504 A039287 A045222 * A045736 A158807 A067006

Adjacent sequences:  A002807 A002808 A002809 * A002811 A002812 A002813




N. J. A. Sloane


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



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Last modified February 22 07:03 EST 2020. Contains 332118 sequences. (Running on oeis4.)