Thursday, October 17, 2013

671

671 = 11 x 61.

671 is a rhombic dodecahedral number.

671 is the 3-digit composite number (k) that yields the greatest percentage of primes from Leonhard Euler's formula x2 + x + k (453 out of 1000 possible primes).

671!/176! + 1 is prime.

671 is the magic constant for an 11 x 11 normal magic square.

671 is the solution for the n-queens problem, for n = 11.

671 is a divisor of 95 - 1.


Source: Prime Curios!

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