Solutions of Ramanujan-Nagell Equation/Mistake

Source Work

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary
$15$


Mistake

The equation $x^2 + 7 = 2^n$ has solutions for only $5$ values of $n$: $3, 4, 5, 7$ and $15$.


Correction

It needs to be pointed out that integer solutions only are under consideration here.

The equation in question is presented as a Diophantine equation.


Sources

  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $15$
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