Monday, November 2, 2009

581

581 = 7 x 83.

581 is the sum of three consecutive primes: 191 + 193 + 197 = 581.

581 has a base 3 representation (210112) that begins with its base 4 representation (21011).

581 becomes a prime when 3 is prefixed or appended: 3581 and 5813 are primes.


Gliese 581 c was the first discovered terrestrial exosolar planet in the habitable zone surrounding its star (where the surface temperatures might be similar to Earth's).

Source: Wikipedia
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