A001166 - OEIS

%I M3215 N1301 #37 Jan 21 2024 09:28:14

%S 1,4,3,11,15,13,17,24,23,73,3000,11000,15000,101,104,103,111,115,113,

%T 117,124,123,173,323,373,1104,1103,1111,1115,1113,1117,1124,1123,1173,

%U 1323,1373,3323,3373,11373,13323,13373,17373,23323,23373,73373,101123,101173,101323,101373,103323,103373,111373,113323,113373,117373

%N Smallest natural number requiring n letters in English.

%C In this version 101 is written "one hundred and one", etc.

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

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

%H Sean A. Irvine, <a href="/A001166/a001166.out.txt">Illustration of terms a(3) through a(75)</a>

%e For n = 6, the smallest natural number requiring 6 letters in English is "eleven." - _Julia Carrigan_, Jan 19 2024

%Y Cf. A000916, A014388, A045494, A045495, A080777.

%K word,nonn

%O 3,2

%A _N. J. A. Sloane_

%E Corrected and extended by _Henry Bottomley_, Jan 28 2000

%E Further corrected and extended by _Brian Galebach_, Feb 06 2004

%E Further corrected and illustration of terms by _Sean A. Irvine_, Mar 12 2012