Prime Number Chart – Primes 1 to 1000 Printable
This prime number chart shows the numbers from 1 to 100, 200, 500 or 1,000 in a grid with every prime highlighted, built with the Sieve of Eratosthenes. Below the chart you get the full list of primes in the range, the count (25 primes below 100 and 168 below 1,000), and twin prime pairs such as 11 and 13. Hover or tap any number to see whether it is prime or, if not, its smallest factor. You can step through the sieve to watch multiples of 2, 3, 5 and 7 crossed out, then print the chart for a classroom wall or homework.
Prime Number Chart
A chart of the numbers 1 to 100, 200, 500 or 1,000 with every prime highlighted.
How to use the Prime Number Chart
- Choose the range: 100, 200, 500 or 1,000.
- Read the highlighted primes on the chart.
- Tap a number to see its smallest factor.
- Press Print, or step through the sieve to see how it works.
Sieve of Eratosthenes
List 2 to n. For each prime p up to √n, cross out p², p² + p, p² + 2p, and so on. The numbers left are prime.
Features
- Primes to 100, 200, 500 or 1,000
- Sieve of Eratosthenes step mode
- Full list and count of primes
- Twin prime pairs
- Tap for the smallest factor
- Print-friendly
Frequently asked questions
What are the prime numbers from 1 to 100?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97. That is 25 primes.
Is 1 a prime number?
No. A prime has exactly two different factors, 1 and itself. The number 1 has only one factor.
How many primes are there below 1,000?
There are 168 prime numbers less than 1,000.
What is the Sieve of Eratosthenes?
A method that lists numbers and crosses out multiples of each prime, starting with 2. The numbers left are primes.
What are twin primes?
Pairs of primes that differ by 2, such as 3 and 5, 17 and 19, or 41 and 43.