863

This number is a prime.

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+ The smallest prime p in a chain of six consecutive primes {863, 877, 881, 883, 887, 907} such that q = 4*p+9 is also a prime. [Loungrides]

+ The largest 3-digit prime with distinct digits such that the sum of repdigit numbers formed by repeating d times each of its digits d is prime, i.e., 88888888+666666+333. [Loungrides]

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