1531

This number is a prime.

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(1531, 1543, 1549) is the first case of three consecutive primes (q, r, s), such that (q^3+r^3+s^3)/3 is prime. [Loungrides]

The smallest prime p such that 2p-1, 3p-2, 4p-3 are prime. [Loungrides]