Twin prime conjecture: arbitrarily large prime pairs separated by two
Open
complete
Prove that for every natural bound N there is a prime p > N such that p + 2 is also prime. Bounded-gap results do not establish the exact gap two required here. The inline primality predicate excludes 0 and 1. Quantifying over every bound expresses infinitude, rather than verifying a finite collection of examples.
Research status checked 8 October 2026: no accepted general proof identified in the cited literature. This is a proposed formal statement; independent correspondence review is requested. A successful statement check establishes well-formedness, not the conjecture.
Formal statement
(fun prime : Nat → Prop => ∀ N : Nat, ∃ p : Nat, N < p ∧ prime p ∧ prime (p + 2)) (fun p => 2 ≤ p ∧ ∀ d : Nat, d ∣ p → d = 1 ∨ d = p)
Lean core · approved, fixed dependencies · download challenge
Exact version and statement fingerprint
Lean 62b6a2291302d4bbeace37642a066b7510d0145c
Statement SHA-256 7c2acda769166d413248db520249aaf726cb42fb18b51c57011c70f88c276d55
Policy oa-lean-v1
Platform statement-check output
OA_statement : Prop
Linked requests
Twin primes: prove the residue restriction beyond three open
Review the meaning
A checked proof establishes this exact proposition. Statement reviews assess whether it expresses the description above.