255

This number is a composite.

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255 (3*5*17) is a sphenic number, i.e., the product of three distinct primes. The next sphenic number is 258 (2*3*43). Curiously, 3² + 5³ + 17⁴³ is prime. [Honaker]

Submitted: 2004-01-21 11:09:47; Last Modified: 2019-10-20 20:03:38.