Tuesday, April 21, 2009

1415

1415 = 5 x 283.

1415 is a number that cannot be written as a sum of three squares.

1415 is the sum of nine consecutive primes: 1415 = 137 + 139 + 149 + 151 + 157 + 163 + 167 + 173 + 179.

1415 is a centered icosahedral number.


In the Battle of Agincourt on Oct. 25,
1415, the archers of Henry V of England were instrumental in defeating an army of French knights.

Source:
What’s Special About This Number?

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