prime number python代码 primes在python 1.题目 2.代码 import os import sys # 请在此输入您的代码 def countPrimes(n): primes=[1]*n count=0 li=[] for i in range(2,n): if primes[i]: count+=1 li.append(i) for j in range(i*i,n,i): primes[j]=0 return count,li n=int(input...
The simplest way to find and print prime numbers from 1 to N in Python is by using basic iteration and checking for each number’s divisibility. Let me show you an example and the complete code. Example: Here is the complete Python code to print prime numbers from 1 to n in Python. ...
python编程..def is_prime(num):if num < 2:return Falsefor i in range(2, num):if num % i == 0:return Falseretur
defis_reversible_prime(n):ifnotis_prime(n):returnFalsereversed_n=int(str(n)[::-1])returnis_prime(reversed_n) 1. 2. 3. 4. 5. 以上代码中,我们首先调用上一节中的is_prime函数来判断数字n是否是素数。若不是素数,则返回False。然后我们使用Python中的切片操作[::-1]将数字n逆序,并转换为整数...
for i in range(1, num): if num % i == 0: sumFactors += i if sumFactors == num: print(num) """ 2.实验4-7 编写程序,找出1～n之间(包含1和n,n是小于等于1000的正整数, 从键盘输入)的全部同构数。所谓同构数,是这样一种数,它出现在它的平方数的右端。
So, To check for prime number, We can simply check for a factor till N1/2 instead of N/2 using a while loop. If a factor is not present between 2 and N1/2, the number must be a prime number. Using this logic, we can modify the isPrime() function used in the above example as...
Program for Palindrome number in Python A palindrome number is a number or a string that when reversed, remains unaltered. num = int(input("Enter a number")) temp = num rvrs = 0 while(num>0): dig = num%10 rvrs = rvrs*10+dig num = num//10 if(temp == rev): print("The number...
第32 行的for循环遍历从2到sieveSize的平方根的每个整数: # Create the sieve: for i in range(2, int(math.sqrt(sieveSize)) + 1): pointer = i * 2 while pointer < sieveSize: sieve[pointer] = False pointer += i 变量pointer从i后i的第一个倍数开始,也就是第 33 行的i * 2。然后while循...
defis_prime(num):# 检查一个数字是否为质数。ifnum<2:returnFalseforiinrange(2,num):ifnum%i==0:returnFalsereturnTrue deffind_nth_prime(n):# 寻找第N个质数。 count=0num=1whilecount<n:num+=1ifis_prime(num):count+=1returnnum 1. ...
(一)、for-in循环 (二)、while循环 1、练习输入一个正整数判断是不是素数。 2、练习输入两个正整数,计算它们的最大公约数和最小公倍数。 3、练习打印如下所示的三角形图案。 项目链接:https://github.com/jackfrued/Python-100-Days 一、Python之禅 ...