进阶之路

摘要： “哇，你们两个同一天生日耶！” “你们居然是同一天生的，太幸运了吧！” 在我们的认知里，感觉两个人是同一天生日的概率非常低。 计算其实也很简单，不考虑闰年，一年有365天。其中一个人是365天里的一天，另一个要是同一天的话，就是1/365，0.274%的几率。 1/365 Out[2]: 0.002 阅读全文

摘要： def primeslist(max): ''' 求max值以内的质数序列 ''' a = [True]*(max+1) a[0],a[1]=False,False for index in range(2, len(a)): if a[index]==True: for i in range(index+i... 阅读全文

摘要： flag = 0 for a in range(1,1000): for b in range(a+1,1000): if a*a + b*b == (1000-a-b)**2: print(a,b) flag = 1 break if flag == 1: break pr... 阅读全文

摘要： 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? 阅读全文

摘要： 先粘实现代码，以后需要再慢慢补充思路 阅读全文

摘要： The sum of the squares of the first ten natural numbers is, 12 + 22 + ... + 102 = 385 The square of the sum of the first ten natural numbers is, (1 + 阅读全文

摘要： 2520 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 i 阅读全文

摘要： 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 阅读全文

摘要： The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? 欧拉题里很多是关于求质数，求质数的方法很多，我推荐的是筛选法，效率高，也很好理解 阅读全文

摘要： 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, 阅读全文