Cramér–Granville conjecture for good-prime gaps

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Let Pgood={g1,g2,…}\mathcal{P}_{\mathrm{good}}=\{g_1,g_2,\ldots\} be the subset of good primes, enumerated in increasing order, where good primes are the primes outside the paper's exceptional set. Cramér–Granville conjecture for good primes. For some η>1\eta>1,

lim sup⁡j→∞gj+1−gj(log⁡gj)2=η.\limsup_{j\rightarrow\infty}\frac{g_{j+1}-g_j}{(\log g_j)^2}=\eta.

The paper motivates this as a strengthening of the ordinary Cramér–Granville conjecture because good primes have density one among all primes. Whether density one is sufficient to preserve these fine prime-gap statistics is not known, so the conjecture remains open.

References

Primary source

Florian Luca, Joël Ouaknine and James Worrell, “Conjectural Decidability of the Skolem Problem”, arXiv:2607.15510 (2026).

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