Asymptotic ratio of non-primonumerophobic and digit-pattern sequences

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Let A267013(d)A267013(d) denote the number of non-primonumerophobic digit patterns of length dd, and let A164864(d)A164864(d) denote the total number of available digit patterns of length dd. Asymptotic ratio conjecture. As d→\ftyd\rightarrow\fty, the ratio of these sequences satisfies

A267013(d)A164864(d)∼9⋅9!dln⁡10.\frac{A267013(d)}{A164864(d)}\sim\frac{9\cdot9!}{d\ln 10}.

The preceding combinatorial estimate yields the same asymptotic expression heuristically, but the supplied source does not establish the corresponding asymptotic for the exact sequences.

References

Primary source

Dmytro S. Inosov and Emil Vlasák, “Cryptarithmically unique terms in integer sequences”, arXiv:2410.21427 (2025).

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