You are given 2 positive integers l and r. For any number x, all positive divisors of x except x are called the proper divisors of x.
A number is called special if it has exactly 2 proper divisors. For example:
\n\nReturn the count of numbers in the range [l, r] that are not special.
\n
Example 1:
\n\nInput: l = 5, r = 7
\n\nOutput: 3
\n\nExplanation:
\n\nThere are no special numbers in the range [5, 7].
Example 2:
\n\nInput: l = 4, r = 16
\n\nOutput: 11
\n\nExplanation:
\n\nThe special numbers in the range [4, 16] are 4 and 9.
\n
Constraints:
\n\n1 <= l <= r <= 109[sqrt(l), sqrt(r)].",
"Use sieve to find primes till sqrt(109)."
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