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Old 2020-03-20, 14:35   #1
enzocreti
 
Mar 2018

17×31 Posts
Default 216 is the only cube that can be written in this way?

216=3^2*(182^2-331*10^2)


is there any other positive cube that can be written as


a^2*(b^2-r*10^2)?


with a and b positive and coprime, r prime?
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