257 is a prime number. It is the second largest known Fermat prime.
257 is 100000001 in base 2 (binary).
257 has a representation as a sum of two squares: 257 = 12 + 162.
257 is the hypotenuse of a primitive Pythagorean triple: 2572 = 322 + 2552.
There are 257 topologically distinct polyhedral graphs of eight nodes.
257 is the smallest three-digit prime with distinct prime digits.
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