This number is a composite.
Single Curio View: (Seek other curios for this number)671 is the 3-digit composite number (K) that yields the greatest percentage of primes from Leonhard Euler's formula: X^2 + X + K. 453 out of 1000 possible primes (45.3%). [Morse]
Submitted: 2002-05-23 23:12:33; Last Modified: 2008-01-30 11:28:00.
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