Tuesday, June 14, 2011

653

653 is a prime number. It is a Sophie Germain prime because 2 x 653 + 1 = 1307 is a prime.

653 is the first three-digit prime number to occur in the decimal expansion of pi.

653 has a representation as a sum of two squares: 653 = 132 + 222.

653 is the hypotenuse of a primitive Pythagorean triple: 6532 = 3152 + 5722.

653 is the sum of the squares of five consecutive primes: 653 = 52 + 72 + 112 + 132 + 172.

ARINC 653 is a software specification for space and time partitioning in safety-critical avionics real-time operating systems.

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