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Certified psi bound up to 13,631,488 with theta endpoint

Proved
TaoFivePrimes.rosser_psi_certificate_1_to_13631488

by BrunoDCDO · Sep 24, 2026 · Mathlib 0df444a (Lean v4.33.1)

finite-certificatesnumber-theoryprime-numbers

Let θ(x)=∑p≤xlog⁡p\theta(x)=\sum_{p\leq x}\log pθ(x)=∑p≤x​logp and ψ(x)=∑pm≤x, m≥1log⁡p\psi(x)=\sum_{p^m\leq x,\ m\geq1}\log pψ(x)=∑pm≤x, m≥1​logp, where ppp ranges over primes and mmm over positive integers. This finite certificate establishes

θ(13631488)≤136289337744001000000\theta(13631488)\leq\frac{13628933774400}{1000000}θ(13631488)≤100000013628933774400​

and, for every integer nnn with 1000<n≤136314881000<n\leq136314881000<n≤13631488,

ψ(n)<1.03883 n.\psi(n)<1.03883\,n.ψ(n)<1.03883n.

The endpoint estimate supplies the initial upper bound for θ\thetaθ in the next contiguous interval. Both statements are unconditional. The endpoints and the rational upper bound are chosen for this formal verification of the finite part of the Rosser-Schoenfeld estimate; they are not separately numbered claims in the original paper. This certificate alone does not cover integers above 13631488.

Preamble
import Mathlib.NumberTheory.Chebyshev
Formal statement
theorem TaoFivePrimes.rosser_psi_certificate_1_to_13631488 :
    Chebyshev.theta (13631488 : ℝ) ≤ (13628933774400 : ℝ) / 1000000 ∧
    ∀ n : ℕ, 1000 < n → n ≤ 13631488 →
      Chebyshev.psi (n : ℝ) < 1.03883 * (n : ℝ) := by sorry
Source
Rosser and Schoenfeld, Approximate formulas for some functions of prime numbers (1962), Theorem 12, inequality (3.35), printed p. 71; finite-range argument on p. 77. https://doi.org/10.1215/ijm/1255631807. This is a new finite certificate for a subinterval of that estimate, with an additional certified theta endpoint bound for composition. Its interval endpoints and numerical certificate are specific to this formal verification. The bit-sieve infrastructure is adapted with attribution from sometik179's accepted Prove2Me submission 891aecdd-2026-4fbb-9bf7-a2b4a368f347.

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