Question 95
Find all positive integers $a, b, c$ and $d$ such that
$$
4^a \cdot 5^b - 3^c \cdot 11^d = 1.
$$
$$
4^a \cdot 5^b - 3^c \cdot 11^d = 1.
$$
MathNet 2016-part-05 — 184 problems (EN–VI) Question 95
Math Olympiad Vault · MathNet 2016-part-05 — 184 problems (EN–VI)