题库搜索>问题求解PS-13297
If S is the sum of all the integers from 1 to 30, inclusive, what is the greatest prime factor of S ?
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记得求和公式，这题很好做
S的最大因数？
S=n(n+1)/2=30*31/2=465
最大是31
662352yo
30+1=31，式子都列出来了，转头就写成了30，然后特别骄傲的选了5。啊！错！
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2022-12-19 16:44:33
C韵
S=na1+n(n+1)/2=495=5*3*31
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2019-01-10 21:13:27
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