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Difficulty: 5/102024 IOQM 2024 (Q29)

Let = 219312. Let M denote the number of positive divisors of n2 which are less than but would not divide n. What is the number formed by taking the last two digits of M (in the same order)?

Guide / Hint

Hint 1: Start by analyzing the initial conditions and setting up the basic equations. n2 = 238 · 324.

Hint 2: Look for algebraic properties, symmetry, or geometric theorems to simplify. => Required number of divisors.

Hint 3: Proceed with the final algebraic steps to solve the system. ( 38 + 1)( 24 + 1) + 1.

Solution

Step 1: n2 = 238 · 324

Step 2: => Required number of divisors

Step 3: ( 38 + 1)( 24 + 1) + 1

Step 4: = − 20 \times 13

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