Highly divisible triangular number

我的那个暴力求解，太耗时间了。 用了网上产的什么因式分解，质因数之类的。确实快！还是数学基础不行，只能知道大约。 The sequence of triangle numbers is generated by adding the natural numbers. So the 7th triangle number would be 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28

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