Originally posted by FabianFnasRight then. Guess I missed that part 😕
No, -1 is negative integer, not positive integer.
And right - misprint. Should be a^4 + 4*b^4 = p.
Okay, we have one solution. So the answer of (a) is no, and proven. One solution is found.
But are there others? Yes? Give examples! No? Prove it!
Are there infinitely many? Prove it!