Asymptotic ratio of non-primonumerophobic and digit-pattern sequences
Let denote the number of non-primonumerophobic digit patterns of length , and let denote the total number of available digit patterns of length . Asymptotic ratio conjecture. As , the ratio of these sequences satisfies
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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