Prime Curios!: 99

99
(another Prime Pages' Curiosity)

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There are 9 ways to express 99 as p + 2q, where p and q are prime. [Hodges]

The 99th prime plus (9+9) is the next prime.

99 = ( prime(9)*prime(9) ). Note that 99 is the only two-digit number with this property. [Firoozbakht]

99!/(99)! + 1 is prime. [Firoozbakht]