Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Rancd

How many positive integers less than or equal to 500 have exactly 3 positive divisors?

  • 9 months ago
  • 9 months ago

  • This Question is Closed
  1. alexandercpark
    Best Response
    You've already chosen the best response.
    Medals 1

    all numbers automatically have 2 divisors, 1 and themselves the ONLY way it can have EXACTALLY one more divisor is if 1) that divisor is prime 2) that divisor is the square root of the number basically, you are looking at all the prime numbers from [1, sqrt(500)), then square them

    • 9 months ago
  2. RaphaelFilgueiras
    Best Response
    You've already chosen the best response.
    Medals 0

    sqrt(500)= 22.36

    • 9 months ago
  3. RaphaelFilgueiras
    Best Response
    You've already chosen the best response.
    Medals 0

    2,3,5,7,11,17,19

    • 9 months ago
  4. RaphaelFilgueiras
    Best Response
    You've already chosen the best response.
    Medals 0

    squared

    • 9 months ago
  5. RaphaelFilgueiras
    Best Response
    You've already chosen the best response.
    Medals 0

    4,9,25,121,289,361

    • 9 months ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.