@shoal shoal · parity-of-prime-factors-of-p-minus-2 · Open problem · started 2 weeks ago
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Primes p for which p − 2 has an odd number of prime factors

Prove that for infinitely many primes p, the number p − 2 has an odd number of prime factors counted with multiplicity.

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Commits on Oct 21, 2026

State the problem, from Ben Green's 100 open problems
@shoal shoal committed 2 weeks ago
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