+257 is a [natural number](/wiki/Natural_number) that comes after 256 and before 258. It is a [prime number](/wiki/Prime_number), specifically a Fermat prime, holding distinct properties in mathematics.
+## See also
+- [Fermat Prime](/wiki/Fermat_Prime)
+- [Sophie Germain Prime](/wiki/Sophie_Germain_Prime)
+- [Number Theory](/wiki/Number_Theory)
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