Tuesday, June 2, 2009

665

665 = 5 x 7 x 19.

665 is the only odd multiple of 5 that is expressible as the difference of sixth powers of two consecutive (2 and 3) primes: 36 – 26 = 665.

665 is 555 in base 11.

665 is a divisor of 113 - 1.


The Indian mathematician and astronomer Brahmagupta (born 598) died in the year 665.

Source: Prime Curios!

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