%I #11 Nov 10 2023 12:26:35
%S 111111111,1001,100,21,14,13,12,11,10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%T 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%U 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9
%N a(n) = 9 written in base n.
%C The term 111....1111 should officially be called the "unary expansion", since in base 1 only the digit 0 may appear.
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F G.f.: x*(111111111 - 111110110*x - 901*x^2 - 79*x^3 - 7*x^4 - x^5 - x^6 - x^7 - x^8 - x^9)/(1 - x). - _Stefano Spezia_, Nov 10 2023
%t Join[{111111111},Table[FromDigits[IntegerDigits[9,n]],{n,2,90}]] (* _Stefano Spezia_, Nov 10 2023 *)
%Y Cf. A001731, A063432, A035613, A094324, A094325, A094326, A094232, etc.
%K nonn,base,easy
%O 1,1
%A _N. J. A. Sloane_, Jun 04 2004
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