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There are well-known formulas: , , . Also mathematicians found similar formulas for higher degrees. Find the value of the sum modulo 109 + 7 (so you s 阅读全文
posted @ 2018-09-13 19:05
nimphy
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Tiny Wong the chef used to be a mathematics teacher in a senior high school. At that time, he always used to tell his students that when there is a sq 阅读全文
posted @ 2018-09-13 11:14
nimphy
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Let's call a non-empty sequence of positive integers a1, a2... ak coprime if the greatest common divisor of all elements of this sequence is equal to 阅读全文
posted @ 2018-09-13 09:14
nimphy
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