Wednesday, April 8, 2009

397

397 is a prime number.

397 is conjectured to be the largest prime that can be represented uniquely as the sum of three positive squares (32 + 82 + 182).

397 is a Cuban prime. Cuban primes, named after differences between successive cubic numbers, have the form n3 - (n - 13).

397 has a representation as a sum of two squares: 397 = 62 + 192.

397 is the hypotenuse of a primitive Pythagorean triple: 3972 = 2282 + 3252.


397 Vienna is an asteroid discovered in 1894.

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