Thursday, July 16, 2009

444

444 = 22 x 3 x 37.

444444 + 5 is prime. Note that 444 is the only known number m such that mm + 5 is prime.

444 = (41 + 41+ 41) + (42 + 42 + 42) + (43 + 43 + 43) + (43 + 43 + 43).

In base 6, 444 is 2020.


St. Patrick founded the Irish city of Armagh in the year 444.

Source: Prime Curios!

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