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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] 2^99 is one less than a 9-almost prime. [Post] The 99th prime plus (9+9) is the next prime.
99 =
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( prime(9)*prime(9) ). Note that 99 is the only
two-digit number with this property. [