1. For every positive even integer n, the fuction h(n) is defined to be the product of all the even integers from 2 to n, inclusive. if p is the smallest prime factor of h(100)+1,then p is
A,between 2 and 1o
E.greater than 40
answer:E
h(100)+1与h(100)互质,h(100)=2*4*……*100=2^50*(1*2*……*49*50)
h(100)的质因数包括所以小于50的质数,h(100)+1肯定不含这些质因数,最小的是51
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