859

+ The largest prime that cannot be the central number in a 3-by-3 prime magic square. [Rivera]

+ Théorie des Nombres by Adrien-Marie Legendre contained 859 large quarto pages and was the first text to record the observation that there seemed to be a curious connection between the prime counting function and the logarithm function.

+ The largest 3-digit distinct-digit prime p such that replacing any of its digits with the digit 3, the result is always a prime, i.e., 359, 839, 853. Note that a concatenation of these three primes, i.e., 359853839 is also prime. [Loungrides]

(There are 3 curios for this number that have not yet been approved by an editor.)

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