Friday, April 24, 2009

389

389 is a prime number.

389 is the first in the smallest set of four consecutive primes (389, 397, 401, 409) that are congruent to 1 (mod 4). In other words, dividing each of these primes by 4 leaves a remainder of 1.

389 has a representation as a sum of two squares: 389 = 102 + 172.

389 is the hypotenuse of a primitive Pythagorean triple: 3892 = 1892 + 3402.


St. Patrick was born in Roman Britain in the year
389 A.D.

Source:
Prime Curios!
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