This number is a prime.

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+ Pierre de Fermat ("The Prince of Amateurs") was once thought to be born in 1601, but this was a different Pierre de Fermat – a half-brother who died in infancy! Did he know that 1601 to the power 1601 ends with 1601? See PC1607. [Capelle]

+ x2 - 79x + 1601 gives primes for x = 0 to 79, with one repetition of each prime obtained. Note that 79 and 1601 are primes. [Capelle]

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