343

This number is a composite.

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343 = (3 + 4)³ is palindromic, along with the fact that 3⁴³ + 34³ is prime. Note that 342³⁴³ + 343³⁴² is prime also. [Kulsha]

Submitted: 2001-06-01 19:55:04; Last Modified: 2008-01-30 17:28:00.