| http://www.w3.org/ns/prov#value | - One of the main reasons why Matthew's heuristic significantly underestimates the abundance of these numbers is that we need to include a factor of $5/2$ for each digit except the last: For each of these digits, given that the original number is prime and the modified number has the same last digit, we already know it is not divisible by $2$ or $5$, which raises its chances of being prime by a facto
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