Question 91
Determine whether the number $\underbrace{11 \ldots 1}_{2016} 2 \underbrace{11 \ldots 1}_{2016}$ is a prime number or a composite number.
MathNet 2017-part-01 — 176 problems (EN–VI) Question 91
Math Olympiad Vault · MathNet 2017-part-01 — 176 problems (EN–VI)