Generate a Random Prime Number
Quickly generate random primes. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate a Random Prime Number
- 1. Set how many primes. Enter How many primes to decide how many prime numbers the generator returns from the interval you specify.
- 2. Set the interval. Enter Interval minimum and Interval maximum to bound the range the tool searches for primes within, such as up to 1000 for small examples or a wider band for larger ones.
- 3. Choose a separator. Set Separator to a comma, space or newline so the resulting primes are formatted the way you plan to use them.
- 4. Copy the primes. Copy the generated prime numbers into a worksheet, script, or test case. Run it again for a different random sample within the same range.
When to use Generate a Random Prime Number
Generate a Random Prime Number picks a set of prime numbers from within an interval you define, saving you from checking primality by hand or searching a table. It suits math practice, teaching, and testing prime-related code.
- Practicing primality testing by hand. A student learning how to check whether a number is prime wants a batch of random primes within a range to verify using trial division.
- Testing an RSA or cryptography demo. Someone building an educational demo of RSA key generation wants sample small primes within a defined range to plug into the multiplication step.
- Building a number theory worksheet. A teacher preparing a lesson on prime factorization wants a fresh set of primes each week within a chosen interval, keeping the worksheet from repeating.
- Sampling primes for a puzzle game. A puzzle designer building a math-based game wants random primes within a specific range to use as level parameters or scoring multipliers.
Examples
Ten random primes up to 1000
Output
7, 641, 89, 2, 199, 467, 3, 829, 113, 571
Five random primes between 100 and 200
Output
101, 197, 139, 163, 107
About the Generate a Random Prime Number tool
Generate a Random Prime Number is a free online tool that works entirely inside your web browser. Quickly generate random primes. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 120 Random utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 4 settings, including How many primes, Interval minimum, Interval maximum and Separator, and the result refreshes the moment you change one. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Generate a Random Prime Number cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.