Prime Curios!: 36

36
(another Prime Pages' Curiosity)

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GIMPS has discovered a new largest known prime number: 2^82589933-1 (24,862,048 digits)

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The smallest even number that cannot be expressed in any of these forms: 2ⁿ, 2ⁿp, with p an odd prime, p+1 with p an odd prime (e.g., 36 = 2²3², 36 = 35 + 1, but 35 is not prime). [Rodrigo]

Submitted: 2004-07-29 13:47:14; Last Modified: 2009-04-26 21:29:30.