Wednesday, October 6, 2010

215

215 = 5 x 43.

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

215 is 3113 in base 4 and 555 in base 6.

2153 = 9,938,375 = (99 + 38 + 3 + 75)3.

215 = 313 - 1.

215 is a telephone area code for the city of Philadelphia.

Source: Numeropedia
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