【活动帖】质数个数的增长速度# BrainTeaser - 大脑工作室o*r2007-05-03 07:051 楼f(x) = 小于等于x的质数个数,i.e. f(10) = 4; f(20) = 8; f(100) = 25O(f(x)*x) = ?
w*02007-05-03 07:052 楼老鬼,已经是后半夜了,歇兵吧~~【在 o********r 的大作中提到】: f(x) = 小于等于x的质数个数,i.e. f(10) = 4; f(20) = 8; f(100) = 25: O(f(x)*x) = ?
d*u2007-05-03 07:053 楼x^2?猜的.【在 o********r 的大作中提到】: f(x) = 小于等于x的质数个数,i.e. f(10) = 4; f(20) = 8; f(100) = 25: O(f(x)*x) = ?
e*x2007-05-03 07:057 楼x^2/logx【在 o********r 的大作中提到】: f(x) = 小于等于x的质数个数,i.e. f(10) = 4; f(20) = 8; f(100) = 25: O(f(x)*x) = ?