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Problem statementSend feedbackYou are given a positive integer ‘N’. Your task is to print all prime numbers less than or equal to N.Note: A prime number is a natural number that is divisible only by 1 and itself. Example - 2, 3, 17, etc.You can assume that the value of N will always be greater than 1. So, the answer will always exist.Detailed explanation ( Input/output format, Notes, Images )Constraints:2 <= N <= 10^7Where ‘N’ is the given positive integer.Time Limit: 1secSample Input 1 :7Sample Output 1 :2 3 5 7Sample Output 1 Explanation:For the given input, all prime numbers from 2 to 7 are 2, 3, 5 and 7.Sample Input 2 :30Sample Output 2 :2 3 5 7 11 13 17 19 23 29

Question

Problem statementSend feedbackYou are given a positive integer ‘N’. Your task is to print all prime numbers less than or equal to N.Note: A prime number is a natural number that is divisible only by 1 and itself. Example - 2, 3, 17, etc.You can assume that the value of N will always be greater than 1. So, the answer will always exist.Detailed explanation ( Input/output format, Notes, Images )Constraints:2 <= N <= 10^7Where ‘N’ is the given positive integer.Time Limit: 1secSample Input 1 :7Sample Output 1 :2 3 5 7Sample Output 1 Explanation:For the given input, all prime numbers from 2 to 7 are 2, 3, 5 and 7.Sample Input 2 :30Sample Output 2 :2 3 5 7 11 13 17 19 23 29

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Solution

To solve this problem, we can use the Sieve of Eratosthenes algorithm, which is an efficient way to find all primes smaller than a given number 'N'. Here are the steps:

  1. Create a list of consecutive integers from 2 through N: (2, 3, 4, ..., N).
  2. Initially, let P equal 2, the smallest prime number.
  3. Enumerate the multiples of P by counting in increments of P from PP to N, and mark them in the list (these will be PP, PP + P, PP + 2P, P*P + 3P, ...; the P itself should not be marked).
  4. Find the smallest number in the list greater than P that is not marked. If there was no such number, stop. Otherwise, let P now equal this new number (which is the next prime), and repeat from step 3.
  5. When the algorithm terminates, the numbers remaining not marked in the list are all the primes below N.

In Python, the code would look something like this:

def sieve_of_eratosthenes(n):
    primes = [True for i in range(n+1)]
    p = 2
    while (p * p <= n):
        if (primes[p] == True):
            for i in range(p * p, n+1, p):
                primes[i] = False
        p += 1
    prime_numbers = []
    for p in range(2, n):
        if primes[p]:
            prime_numbers.append(p)
    return prime_numbers

N = 30
print(sieve_of_eratosthenes(N))

This will print all prime numbers less than or equal to N.

This problem has been solved

Similar Questions

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