A075826 - OEIS

%I #23 Apr 21 2023 13:17:17

%S -4,-2,-1,-2,0,1,3,2,3,5,7,5,6,5,6,8,9,8,10,11,14,12,13,12,14,15,17,

%T 16,17,19,24,22,23,22,24,25,27,26,27,29,35,33,34,33,35,36,38,37,38,40,

%U 45,43,44,43,45,46,48,47,48,50,55,53,54,53,55,56,58,57,58,60,63

%N n minus (number of letters in English name of n).

%C a(n) < 0 for n < 4, a(n) = 0 for n = 4 and a(n) > 0 for n > 4. - _Bernard Schott_, Feb 11 2020

%C The French variant would be n - A167507(n) = (-4, -1, -2, -2, -2, 1, 3, 3, 4, 5, 7, 7, 7, 7, 6, 9, 11, ...). The German variant would be n - A007208(n) = (-3, -2, -1, 0, 1, 1, 1, 4, 5, 6, 8, 7, 5, 6, 7, 8, 9, 10, ...). - _M. F. Hasler_, Mar 02 2020

%D GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See pages 49 and 214.

%F a(n) = n - A005589(n). - _Michel Marcus_, Feb 11 2020

%e Seven contains 5 letters, therefore a(7) = 7 - 5 = 2.

%o (PARI) A075826(n)=n-A005589(n) \\ _M. F. Hasler_, Mar 02 2020

%Y Cf. A005589.

%K sign,word,less

%O 0,1

%A _Jon Perry_, Oct 14 2002

%E Corrected and extended by _David W. Wilson_, Jul 04 2005