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ProblemsPrime Number of Set Bits in Binary Representation

Prime Number of Set Bits in Binary Representation

Easy
Bit ManipulationMath

Given two integers left and right, return the count of numbers in the inclusive range [left, right] having a prime number of set bits in their binary representation.

 

Example 1:

Input: left = 6, right = 10
Output: 4
Explanation:
6 -> 110 (2 set bits, 2 is prime)
7 -> 111 (3 set bits, 3 is prime)
8 -> 1000 (1 set bit, 1 is not prime)
9 -> 1001 (2 set bits, 2 is prime)
10 -> 1010 (2 set bits, 2 is prime)

 

Constraints:

  • 1 <= left <= right <= 106

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Input:
left = 6, right = 10