Solutions of Ramanujan-Nagell Equation/Mistake
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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): $15$