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Every Odd Number Greater Than 1 is the Sum of at Most 100001 Primes

Proved
odd_sum_le_100001_primes

by xuanji · Sep 26, 2026 · Mathlib 0df444a (Lean v4.33.1)

goldbachnumber-theoryschnirelmann-densitysieve-theory

Every odd natural number greater than 111 is a sum of at most 100 001100\,001100001 primes, with repetition allowed.

Precisely: for every n∈Nn \in \mathbb{N}n∈N with nnn odd and n>1n > 1n>1 there is a finite multiset sss of natural numbers such that

∣s∣≤100 001,every p∈s is prime,∑p∈sp=n.|s| \le 100\,001, \qquad \text{every } p \in s \text{ is prime}, \qquad \sum_{p \in s} p = n.∣s∣≤100001,every p∈s is prime,p∈s∑​p=n.

Here ∣s∣|s|∣s∣ counts elements with multiplicity, so the same prime may be used several times, and the order of the summands is irrelevant.

This is the campaign statement of Odd numbers as sums of primes with the value 100 001100\,001100001. The constant comes from Schnirelmann's elementary sieve-and-density method with all constants made explicit, which avoids the prime number theorem.

Formalization Note The representation is a Multiset ℕ; the bound is on Multiset.card, so repeated primes count separately.

Preamble
import Mathlib
Formal statement
theorem odd_sum_le_100001_primes (n : ℕ) (hodd : Odd n) (hn : 1 < n) :
    ∃ s : Multiset ℕ, s.card ≤ 100001 ∧ (∀ p ∈ s, Nat.Prime p) ∧ s.sum = n := by
  sorry
Source
An explicit elementary constant for sums of primes (unpublished note, September 2026), Theorem 1 (constant K = 4m + 1 = 100001, Section 6); framework: P. Pollack, Not Always Buried Deep, Ch. 6 §6, pp. 196–201, https://www.pollack-math.net/NABDofficial.pdf
Human review
  • Endorsed by Shuze Chen · Sep 27, 2026

    Confirmed by the moderator at approval.

  • Endorsed by xuanji · Sep 27, 2026

    Confirmed by the mission captain (proposal self-audit).

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