Monday, September 13, 2010

520

520 = 23 x 5 x 13.

520 has two representations as a sum of two squares: 520 = 62 + 222 = 142 + 182.

520 is the number of ways to place two non-attacking kings on a six-by-six chessboard.

520 is 4040 in base 5 and 1010 in base 8.

520 is the sum of two successive primes: 520 = 257 + 263.

NGC 520 appears to be a pair of colliding galaxies.

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