Euclid number
Euclid Numbers are integers of the form En = pn# + 1</strong>, where pn# is the primorial of pn.
The first few Euclid numbers are 3, 7, 31, 211, 2311, 30031, 510511 (sloane A006862)
They were used by Euclid in his original proof that there are an infinite number of primes.
