Generate Composite Numbers
Create a list of numbers that are not prime. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate Composite Numbers
- 1. Set How many terms. There's nothing to paste here. Start by choosing how many composite numbers to generate under How many terms.
- 2. Understand composite numbers. A composite number has more than two positive divisors, meaning it's not prime and not equal to one, so the sequence skips 1 and every prime along the way.
- 3. Copy the sequence. Set the Separator, then copy the generated list, such as the first ten composite numbers, from the output pane into your worksheet or reference notes.
When to use Generate Composite Numbers
Generate Composite Numbers lists numbers that are not prime, meaning each one factors into more than just one and itself. It's the direct counterpart to a prime number list, useful whenever a task needs non-prime values specifically.
- Teaching the distinction between prime and composite. A math lesson introducing prime versus composite numbers benefits from a ready list of composites to contrast against a list of primes side by side.
- Building test cases for a primality-checking function. You're writing code that identifies whether a number is prime, and need a known list of composite numbers to confirm the function correctly rejects them.
- Selecting non-prime values for a factoring exercise. A worksheet on factorization needs numbers that actually have multiple factors to practice on, ruling out primes which only factor trivially.
- Filling in a number classification chart. You're building a chart that categorizes small integers as prime, composite or neither, and need a verified list of composites to populate it correctly.
Examples
The first ten composite numbers
Output
4, 6, 8, 9, 10, 12, 14, 15, 16, 18
About the Generate Composite Numbers tool
Generate Composite Numbers does its work locally, right in the browser. Create a list of numbers that are not prime. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Number Tools collection on EditSafely, a set of 194 small, focused Number utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including How many terms and Separator, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Generate Composite Numbers free to use?
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?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
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?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.