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404. Find all the numbers in the range which has prime set bits.
Objective: Given a range, find all the numbers in the range which has prime set bits.
Example:
L = 4, R = 10 Output: 5 Explanation: 4 = 1 0 0 ( not prime) 5 = 1 0 1 (prime) 6 = 1 1 0 (prime) 7 = 1 1 1 (prime) 8 = 1 0 0 0 ( not prime) 9 = 1 0 0 1 (prime) 10 = 1 1 0 0 (prime) Total 5 numbers which has prime set bits.
Approach:
 Iterate through all numbers from L to R
 For each number, count no of set bits.
 check if the count is a prime number, if yes add it to result.
Time Complexity: O( N Sqrt (N) )
This algorithm can be improved using Sieve of Eratosthenes Algorithm. We will implement that in our next article  Numbers with prime set bits in a given range using Sieve of Eratosthenes Algorithm
Output:
5