Thursday, March 7, 2013

550

550 = 2 x 5 x 5 x 11.

550 is a pentagonal pyramidal number (A002411).

505 is 202101 in base 3. It is 1414 in base 7.

550 is the number of primes less than 4000 (A028505 and A038812).

550 is a divisor of 434 - 1.


Source: What's Special About This Number?
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