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
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:
- Create a list of consecutive integers from 2 through N: (2, 3, 4, ..., N).
- Initially, let P equal 2, the smallest prime number.
- 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).
- 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.
- 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.
Similar Questions
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