Monday, January 31, 2011

661

661 is a prime number.

661 has a representation as a sum of two squares: 661 = 62 + 252.

659 and 661 form a twin prime pair.

661 is the hypotenuse of a primitive Pythagorean triple: 6612 = 3002 + 5892.


Physicist William Thomson, Lord Kelvin (1824-1907) published 661 papers on a wide range of scientific topics.

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