 89 number - In other fields: Encyclopedia II - 89 number - In mathematicsEighty-nine is the 24th prime number, following 83 and preceding 97. 89 is a Chen prime. It is the smallest Sophie Germain prime to start a Cunningham chain of the first kind of six terms, {89, 179, 359, 719, 1439, 2879}. 89 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
89 is a Fibonacci number. Its reciprocal has a curious relationship to the Fibonacci sequence F(n):
89 is also a Markov number, appearing in solutions to the Markov Diophantine equati ...
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