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(another Prime Pages' Curiosity)
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312 = prime(3*1*2) * phi(3*1*2) * sigma(3*1*2). It is the only known number with this property (up to 10^8). [Firoozbakht]

 

  Submitted: 2009-07-20 09:19:37;   Last Modified: 2009-07-20 09:45:34.



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