0%

Problem 704


Problem 704


Factors of Two in Binomial Coefficients

Define g(n,m) to be the largest integer k such that 2k divides (nm). For example, (125)=792=233211, hence g(12,5)=3. Then define F(n)=maxg(n,m):0mn. F(10)=3 and F(100)=6.

Let S(N) = n=1NF(n). You are given that S(100)=389 and S(107)=203222840.

Find S(1016).


二项式系数中的质因数二

g(n,m)为使得2k整除(nm)的最大整数k。例如,(125)=792=233211,因此g(12,5)=3。再定义F(n)=maxg(n,m):0mn。已知F(10)=3F(100)=6

S(N) = n=1NF(n)。已知S(100)=389S(107)=203222840

S(1016)


Gitalking ...