[Scrambler Bob]

which can be written as x2 – dy2 = 1.

how about x=2, d=3, y=1?

I must be missing something.

[AndyJackson]

Solved it. Write it down and send it in and wait for your Field’s Medal.

[CapnJack]

“which can be written as x2 – dy2 = 1.

how about x=2, d=3, y=1?

I must be missing something.”

Exactly ... there has to be some trick to it.

[RinaseaofDs]

LOL, you’re BRILLIANT!!