ON THE NATURAL DENSITY OF THE RANGE OF THE TERMINATING NINES FUNCTION

ROBERT K. KENNEDY ； CURTIS N. COOPER VLADIMIR DROBOT ； FRED HICKLING

《International Journal of Mathematics and Mathematical Sciences》 1989卷 (1989/12) Pp. 805-808

https://doi.org/10.1155/S0161171289000992

摘要

Noting that the expression (The equation is abbreviated) gives the number of terminating nines which occur up to n but not including n, we will denote the above expression by t(n) and call t the ＂terminating nines function＂. The natural density of the set T= {t(n): n=1,2,3, ...} will be determined.

關鍵字

Digital sums ； terminating nines ； natural density