Math Problem Statement

What is the maximum power of n such that n divides 500! (500 factorial)?

Solution

The question in the image asks:

"What is the maximum power of n such that n divides 500! (500 factorial)?"

This is a typical problem of finding the largest exponent kk such that a number nkn^k divides 500!500!.

Step-by-Step Solution:

Let’s assume nn is a prime number. To find the highest power kk of a prime nn that divides 500!500!, we use Legendre’s formula (also called de Polignac's formula):

k=i=1500nik = \sum_{i=1}^{\infty} \left\lfloor \frac{500}{n^i} \right\rfloor

Where x\left\lfloor x \right\rfloor denotes the greatest integer less than or equal to xx, and nin^i is the successive powers of the prime nn.

The steps are:

  1. Divide 500 by nn (the prime number).
  2. Divide the result by nn again (repeating until the division is zero).
  3. Sum all the quotients (rounded down).

If nn is a composite number, first factorize it into primes and apply the formula to each prime factor separately.


If you provide a specific value for nn, I can compute the answer for that prime or composite number.

Would you like more details or help with a specific value of nn?

Follow-Up Questions:

  1. How is Legendre’s formula used in prime factorization of factorials?
  2. What is the highest power of 2 that divides 500!?
  3. Can we apply the same method to non-prime values of nn?
  4. What role do prime numbers play in this type of divisibility problem?
  5. How would the solution change if the factorial were a different number, like 1000!?

Tip: For composite numbers, always break them down into their prime factors before applying Legendre’s formula!

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Math Problem Analysis

Mathematical Concepts

Factorials
Divisibility
Prime Factorization

Formulas

Legendre's formula: k = sum(floor(500 / n^i))

Theorems

Legendre's Theorem on prime power divisibility of factorials

Suitable Grade Level

Grades 10-12