Question 160
Find all triples $\left(a, b, c\right)$ of strictly positive integers such that
$$
3^{a}-5^{b}=c^{2}
$$
$$
3^{a}-5^{b}=c^{2}
$$
MathNet 2019-part-02 — 184 problems (EN–VI) Question 160
Math Olympiad Vault · MathNet 2019-part-02 — 184 problems (EN–VI)