Python program to print prime numbers from 1 to n
Prime numberA prime number is an integer greater than 1 whose only factors are 1 and itself. A factor is an integer that can be divided evenly into another number. Show LogicTo print all the prime numbers up to N, we start one loop from 2 to N and then inside the loop we check current number or “num” is prime or not. To check if it is prime or not we again need one nested loop. It is not an efficient way to check prime number but it is simpler to understand the basic of looping in Python. See also: Check whether a number is prime number or not Program# Take input from user upto = int(input("Find prime numbers upto : ")) print("\nAll prime numbers upto", upto, "are : ") for num in range(2, upto + 1): i = 2 for i in range(2, num): if(num % i == 0): i = num break; # If the number is prime then print it. if(i != num): print(num, end=" ") Output
View Discussion Improve Article Save Article View Discussion Improve Article Save Article Given a number N, the task is to print the prime numbers from 1 to N. Input: N = 10 Output: 2, 3, 5, 7 Input: N = 5 Output: 2, 3, 5 Algorithm:
Below is the implementation of the above approach: C++
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Output 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 Time Complexity: O(N^2), Auxiliary Space: O(1)
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Output 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 Time Complexity: O(N2), Auxiliary Space: O(1),since no extra space has been taken.
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Output 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 Time Complexity: O(N^(3/2)), Auxiliary Space: O(1) You can further optimize the time complexity to O(n*log(log(n))). CheckSieve of Eratosthenes. How do you find a prime number from 1 to n?C program for prime numbers between 1 to n. #include int main(){. int num,i,count,n; printf("Enter max range: ");. scanf("%d",&n);. for(num = 1;num<=n;num++){. count = 0;. for(i=2;i<=num/2;i++){ if(num%i==0){. count++; break;. How do you find the prime numbers from 1 to 50 in python?lower = int(input("Enter lower range: ")). upper = int(input("Enter upper range: ")). for num in range(lower,upper + 1):. if num > 1:. for i in range(2,num):. if (num % i) == 0:. break.. How do you find prime numbers from 1 to 1000 in Python?for num in range(1,1001): if num > 1: for i in range(2,num): if (num % i) == 0: break else: print(num,"is a prime number!") First thing would be, if num >= 1: after that, you have if (num % i) == 0 break that is why it is stopping there.
How do you find all prime numbers up to n?2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
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