Prime numbers - practice problems
Number of problems found: 406
- Most divisors
Find the number with the most divisors from the natural numbers 1 to 100.
- Primes 2
Which prime number is number 2022 divisible?
- Cube root
Find the cube root of 18
- Prime factors
Factor the number 6600 into the product of prime numbers.
- Simplest form of a fraction
What is 7/21 in simplest form?
Determine all divisors of number 90.
- What fraction
What fraction of numbers 1 to 30 is prime?
- Primes 2
For what primes p,q,r is true: p²-(q+r)²=647
- Is prime?
Which of the following numbers is prime? 21,11,18,25
- Calculate 67294
Calculate the sum of all divisors of the number 70.
- LCM of three ints
Find the least common multiple (LCM) of three numbers: 50, 120, and 135.
- Year 2018
The product of the three positive numbers is 2018. What are the numbers?
- Lcm simple
Find the least common multiple of these two numbers: 140 175.
What is the least common multiple of 5, 50, 14?
- Divisibility 47523
Which of the top ten is not a divisible number of 2520? Use divisibility features to solve
- Two numbers 15
Two numbers have a sum of 12 and a product of 27. What is the larger number?
- Common divisors
Find all common divisors of numbers 30 and 45.
- LCM of two number
Find the smallest multiple of 63 and 147
- Chebyshev formula
To estimate the number of primes less than x Chebyshev formula is used: Pi(x) = 1.11 (x)/(ln x). Estimate the number of primes less than 30300537.
- Six-digit 4787
Which largest six-digit number has a digit sum of 27?