MathDB
Q3- Hanoi Open Mathematical Olympiad 2012 - Junior Section

Source:

June 10, 2012

Problem Statement

Q3. For any possitive integer aa, let [a]\left[ a\right] denote the smallest prime factor of a.a. Which of the following numbers is equal to [35]\left[ 35 \right] ? (A)  [10];(B)  [15];(C)  [45];(D)  [55];(E)  [75].(A) \; \left[10 \right]; \qquad (B) \; \left[ 15 \right]; \qquad (C ) \; \left[45 \right]; \qquad (D) \; \left[ 55 \right]; \qquad (E) \; \left[75 \right].
Back to ProblemsView on AoPS