Approximate formulas for some functions of prime numbers by J. Barkley Rosser and Lowell Schoenfeld 2026-11-05
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Theorem 15, equations (3.41)–(3.42), printed pp. 71–72, give the Rosser–Schoenfeld totient bound. The coefficient 2.5 has an exception at 223092870; 2.50637 covers that case as well. Section 9 contains the proof.
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