Monday, November 21, 2011

225

225 = 32 x 52.

225 = 152. 225 is the smallest square that starts with two identical digits.

225 is the smallest square whose external digits (25) form a square, and whose internal digits (2) form a prime.

225 is the only three-digit square with all prime digits.

225 has a representation as a sum of two squares: 225 = 92 + 122.

225 is a divisor of 262 - 1.

225 is an octagonal number. It is also a centered octagonal number.

A Scrabble board has 225 squares.

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