Prime numbers - math problems
Number of problems found: 222
- Prime factors
Factor the number 6600 into the product of prime numbers.
- Primes 2
Which prime numbers is number 2025 divisible?
- Sum of two primes
Christian Goldbach, a mathematician, found out that every even number greater than 2 can be expressed as a sum of two prime numbers. Write or express 2018 as a sum of two prime numbers.
Make decomposition using prime numbers of number 155. Result write as prime factors (all, even multiple)
- Prime factors
Write 98 as product of prime factors
- Prime divisors
Find 2/3 of the ratio of the sum and the product of all prime divisors of the number 120.
- Prime number
Jan wrote any number from 1 to 20. What is the probability that he wrote the prime number?
- Six-digit primes
Find all six-digit prime numbers that contain each one of digits 1,2,4,5,7 and 8 just once. How many are they?
- Unknown number
Unknown number is divisible by exactly three different primes. When we compare these primes in ascending order, the following applies: • Difference first and second prime number is half the difference between the third and second prime numbers. • The prod
In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?
- Amazing number
An amazing number is name for such even number, the decomposition product of prime numbers has exactly three not necessarily different factors and the sum of all its divisors is equal to twice that number. Find all amazing numbers.
- Year 2018
The product of the three positive numbers is 2018. What are the numbers?
- Jhon Regand
Jhon Regand is reading a 435-page novel. If he reads the same number of pages per day and the number is a prime number greater than 10, how many pages per day will he read?
- Common divisors
Find all common divisors of numbers 30 and 45.
- The tickets
The tickets to the show cost some integer number greater than 1. Also, the sum of the price of the children's and adult tickets, as well as their product, was the power of the prime number. Find all possible ticket prices.
- Lcm of three numbers
What is the Lcm of 120 15 and 5
How many are three-digit natural numbers divisible by 25?
Sort fractions ? by its size. Result write as three serial numbers 1,2,3.
- Lcm 2
Create the smallest possible number that is divisible by numbers 5,8,9,4,3
- Count of roots
How many solutions has equation x. y = 7757 with two unknowns on the set of natural numbers?