Improve Sieve of Eratosthenes article: expanded explanations, added code and comments for odd-only and optimized sieves, and corrected mathematical typos. #1483
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…ode and comments for odd-only and optimized sieves, and corrected mathematical typos.
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Expanded key explanations (e.g. why sieving starts from p*p and how ceil(L/p)*p avoids marking the prime itself)
Added well-commented code for:
Odd-only sieve
Segmented sieve
Prime count via blocks
Sieve over arbitrary range [L, R]
Corrected mathematical typos in writing intervals.