1+7+7^2+7^3 = 400, a perfect square. Is 1+n+n^2+n^3 a perfect square infinitely often? Another example with n prime?
I think you should credit this one to Fermat, 1657. By the way, what about 1 + 3 + 3^2 + 3^3 + 3^4 = 121, a perfect square?
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I think you should credit this one to Fermat, 1657. By the way, what about 1 + 3 + 3^2 + 3^3 + 3^4 = 121, a perfect square?