Primorial Prime

Primorial primes are prime numbers of the form pn# 1, where pn# is the primorial of pn. pn# - 1 is prime for n = 2, 3, 5, 6, 13, 24, ... (Sloane A057704) pn# + 1 is prime for n = 1, 2, 3, 4, 5, 11, ... (Sloane A014545) The largest known primorial prime is 392113#+1, found in 2001 by Daniel Heuer. The idea of primorial primes appears in Euclid's proof of the infinitude of the prime numbers.

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