Highly divisible triangular number

我的那個暴力求解，太耗時間了。 用了網上產的什麼因式分解，質因數之類的。確實快！還是數學基礎不行，只能知道大約。 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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