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RSS订阅原创 求解平方和中各数的和为定值的各数的乘积
A Pythagorean triplet is a set of three natural numbers, a a^2 + b^2 = c^2For example, 3^2 + 4^2 = 9 + 16 = 25 = 5^2.There exists exactly one Pythagorean triplet for which a + b + c = 10
2014-11-10 16:05:26
750
原创 第10001个素数
题目By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.What is the 10 001st prime number?
2014-11-05 12:02:33
1605
原创 求螺旋矩阵对角线的和
Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows:21 22 23 24 2520 7 8 9 1019 6 1 2 1118 5 4 3 1217 16 15 14 13It can be
2014-09-25 10:20:04
1232
原创 和的平方与平方和的差值
'''题目出处：The sum of the squares of the first ten natural numbers is,12 + 22 + ... + 102 = 385The square of the sum of the first ten natural numbers is,(1 + 2 + ... + 10)2 = 552 = 3025Hence the d
2014-09-18 11:54:19
1956
原创 Smallest multiple 求1-20的最小公倍数
'''题目出处：https://projecteuler.net/problem=52520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.What is the smallest positive number that is even
2014-09-17 18:13:30
1225
原创 最大的回文数
'''A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.Find the largest palindrome made from the product of two 3-
2014-09-16 11:56:36
1615
原创 Even Fibonacci numbers
'''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, ...By considerin
2014-09-11 14:47:44
450
原创 Multiples of 3 and 5
'''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.
2014-09-10 11:29:35
481
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