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A063945 Number of nonnegative integers with n digits. 4

%I #16 Dec 31 2022 11:28:31

%S 10,90,900,9000,90000,900000,9000000,90000000,900000000,9000000000,

%T 90000000000,900000000000,9000000000000,90000000000000,

%U 900000000000000,9000000000000000,90000000000000000,900000000000000000,9000000000000000000,90000000000000000000

%N Number of nonnegative integers with n digits.

%C Also, first differences of A000533. - _Omar E. Pol_, Feb 24 2011

%F a(1) = 10, a(2) = 90, a(n) = a(n-1)*10 for n>2.

%F a(n) = A052268(n), n>1. - _R. J. Mathar_, Oct 02 2008

%p a:= n-> `if`(n=1, 10, 9*10^(n-1)):

%p seq(a(n), n=1..30); # _Alois P. Heinz_, Sep 12 2012

%t Join[{10},NestList[10#&,90,20]] (* _Harvey P. Dale_, Dec 31 2022 *)

%Y Column k=1 of A216653.

%K base,easy,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Sep 01 2001

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)