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Old 2020-05-18, 02:39   #9
R.D. Silverman
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Nov 2003

22·5·373 Posts

Originally Posted by JeppeSN View Post
Yes, I wonder if there is any explanation why the four of them are prime squares. Apparently not. I did check that 2^74207283 - 7 is not a square, ha ha.

Edit: It has been proved that 2^{p+2} - 7 is never going to be square again.

Do people not understand the difference between math and numerology?
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