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原题：Starting in the top left corner of a 22 grid, there are 6 routes (without backtracking) to the bottom right corner.How many routes are there through a 2020 grid?翻译：/** 解释：* 2乘2的正方形，左上角到右下角是这样6种走法。*... 阅读全文
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原题：By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6thprime is 13.What is the 10001stprime number?翻译：列出前6个素数分别是：2，3，5，7，11，和13，我们发现第6个素数是13。那么第 10001 个素数是多少？思路：代码Co... 阅读全文
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原题：/** 原题：* A Pythagorean triplet is a set of three natural numbers, a b c, for which,* * a^2 + b^2 = c^2* * For example, 32 + 42 = 9 + 16 = 25 = 52.* * There exists exactly one Pythagorean triplet fo... 阅读全文
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原题：/** 原题：* Find the greatest product of five consecutive digits in the 1000-digit number.* 73167176531330624919225119674426574742355349194934* 96983520312774506326239578318016984801869478851843* 8586... 阅读全文
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原题：Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...Find the sum of all... 阅读全文
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原题：/** 原题：* If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.* * Find the sum of all the multiples of 3 or 5 below 1000.... 阅读全文