Tuesday, September 20, 2011

247

247 = 13 x 19. Its digits sum to the smallest prime factor: 2 + 4 + 7 = 13.




247 is the smallest possible difference between two integers that together contain each digit exactly once: 247 = 50,123 - 49876.


2472 is one of six square numbers that use the same digits: 2472 = 61,009; 1302 = 16.900; 1402 = 19,600; 3102 = 96,100; 1032 = 10,609; and 3012 = 90,601.


247 Eukrate is a large, dark asteroid discovered in 1885.



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