标题: PP3数学题 [打印本页]
作者: armymans 时间: 2006-4-30 19:22 标题: PP3数学题
every even integer n
the function of h(n)=product of the even integers from 2 to n inclusive
if p is the smallest prime factor of h(100)+1
p is
(a) between 2-10
(b)between 10-20
(c) bet 20-30
(d)bet 30-40
(e) over 40
作者: himba 时间: 2006-5-1 07:04
1.h(100)=2*4*6*...*100 其最小的质因数为47,则h(100)+1的最小质因数应该>47
列出质数:2,3,5....23,..47,53,
53不合本题,因为最大的100,的最大质因数到47
ANS:E吧
作者: armymans 时间: 2006-5-8 13:47
谢谢版主。
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