Let's Make Prime Numbers Prime!
It is known that the set of two-prime-digit prime integers is .
If we put in the leftmost position of each integer, then we have , which are all prime integers.
If we do the same from these three-digit numbers to get , are these four-digit integers all prime?
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3337 = 59^2 - 12^2 = 47*71, so composite. Ed Gray