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A213006 Positive numbers that, spelled in English, are as long as the spelling of their digits. 2

%I

%S 1,2,3,4,5,6,7,8,9,11,12,13,15,18,1001,1002,1003,1004,1005,1006,1007,

%T 1008,1009,1010,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,

%U 3001,3002,3003,3004,3005,3006,3007,3008,3009,3010,4001,4002,4003,4004,4005,4006,4007,4008,4009,4010,5001,5002,5003,5004,5005,5006,5007,5008,5009,5010,6001,6002,6003

%N Positive numbers that, spelled in English, are as long as the spelling of their digits.

%C _Dan Hoey_ came up with an inequality Spell_Length(n)<=A*n+B (I've forgotten A and B, which are fairly small rationals: equality at two points), that was used to limit the maximum length of a self-enumerating sentence, and thus make an exhaustive search possible. - _R. H. Hardin_, Feb 22 2012

%D Eric Angelini, Posting to Sequence Fans Mailing List, Feb 12 2012

%D Hans Havermann, Posting to Sequence Fans Mailing List, Feb 23 2012

%H Hans Havermann, <a href="/A213006/b213006.txt">Table of n, a(n) for n = 1..10000</a>

%e 11 = eleven (6 letters) = one one (6 letters)

%e 1002 = one thousand two (14 letters) = one zero zero two (14 letters).

%K nonn,base,word

%O 1,2

%A _N. J. A. Sloane_, Jun 01 2012

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Last modified December 3 00:23 EST 2022. Contains 358510 sequences. (Running on oeis4.)