X

DAYS

:

HOUR

:

MINS

:

SEC

Copied to Clipboard
Mersenne Prime
Easy Accuracy: 34.78% Submissions: 23 Points: 2

Mersenne Prime is a prime number that is one less than a power of two. In other words, any prime is Mersenne Prime if it is of the form 2k-1 where k is an integer greater than or equal to 2. First few Mersenne Primes are 3, 7, 31 and 127.
The task is to find all Mersenne Primes smaller than equal to an input positive integer n.

 

Example 1:

Input: n = 10
Output: 3 7
Explanation:3 and 7 are only prime numbers
which are less than equal to 10 and in the
form of 2k - 1. 

Example 2:

Input: n = 100
Output: 3 7 31
Explanation: 3, 7 and 31 are only prime
numbers which are less than equal to 100
and in the form of 2k - 1.

Your Task:
You don't need to read or print anything. Your task is to complete the function AllMersennePrimeNo() which takes n as input parameter and returns a list of all Mersenne Primes less than or equal to n in sorted order.

Expected Time Complexity: O(n * log(log(n))
Expected Space Complexity: O(n)

Constraints: 
1 <= n <= 100000 

 

We are replacing the old Disqus forum with the new Discussions section given below.
Click here to view old Disqus comments.


to report an issue on this page.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

Yes

All Submissions

My Submissions:

Login to access your submissions.

Mersenne Prime

Output Window