Prime Curios!: 6437

6437
(another Prime Pages' Curiosity)

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The largest known composite number for which the quotient of the repunit R(n) divided by R(a)*R(b) [a and b the factors of n] forms a unique prime. I.e., 6437 = 41*157 and R(6437)/(R(41)*R(157)) is prime.

Submitted: 2004-08-26 18:29:48; Last Modified: 2008-01-30 11:28:00.