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Project Euler 23:Find the sum of all the positive integers which cannot be writt

A perfect number is a number for which the sum of its proper divisors is exactly equal to the number. For example, the sum of the proper divisors of 28 would be 1 + 2 + 4 + 7 + 14 = 28, which means tha ...
pythonprojecteuler 
EmmaZhao 评论(0) 有828人浏览 2013-05-16 12:08

求最小公倍数

What is the smallest number divisible by each of the numbers 1 to 20? [my resolutio]  find the prime number first.beside the prime number ,find every number's smallest factor,then delete the equals f ...
projecteuler 
jonson 评论(0) 有1040人浏览 2011-08-29 13:32

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