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A094327
a(n) = 9 written in base n.
3
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, 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, 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
OFFSET
1,1
COMMENTS
The term 111....1111 should officially be called the "unary expansion", since in base 1 only the digit 0 may appear.
FORMULA
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
MATHEMATICA
Join[{111111111}, Table[FromDigits[IntegerDigits[9, n]], {n, 2, 90}]] (* Stefano Spezia, Nov 10 2023 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, Jun 04 2004
STATUS
approved