Continue a Number Sequence
Find patterns and extend sequences. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Continue a Number Sequence
- 1. Paste the known sequence. Enter the numbers you already have, separated by commas, into the input pane. Include enough terms for a pattern like a linear, geometric or Fibonacci-style rule to be detectable.
- 2. Set how many terms to add. Enter a value in Terms to add to control how far past the given numbers the sequence extends, whether you need just the next term or a dozen more.
- 3. Read the extended sequence. The tool detects the underlying pattern, such as a constant difference, ratio, or a recurrence like Fibonacci, using finite differences, and appends new terms following that rule.
When to use Continue a Number Sequence
Continue a Number Sequence detects the pattern behind a list of numbers and extends it by a chosen number of terms. It handles arithmetic, geometric and recurrence-based sequences like Fibonacci without you naming the rule.
- Solving an IQ or aptitude test question. A test question shows five numbers and asks for the next two. Pasting the sequence and setting Terms to add to 2 reveals the pattern and the expected continuation.
- Extending a Fibonacci-style sequence. You started listing Fibonacci numbers by hand for a project and want the next ten terms without manually adding the previous two each time.
- Verifying a formula from a dataset. A spreadsheet column follows an arithmetic or geometric progression and you want to confirm the pattern and predict future values before building a formula around it.
- Checking a puzzle or brainteaser answer. A recreational math puzzle gives a sequence with a hidden rule, and running it through the tool confirms whether your guessed pattern matches the detected continuation.
Examples
Continue the Fibonacci numbers
Input
0, 1, 1, 2, 3, 5, 8
Output
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89
Continue the square numbers
Input
1, 4, 9, 16, 25
Output
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
About the Continue a Number Sequence tool
Continue a Number Sequence runs as plain JavaScript in your browser tab, with no server behind it. Find patterns and extend sequences. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Math Tools section, 234 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Terms to add setting, and the result refreshes the moment you change it. 2 worked examples further down the page show exactly what the tool produces for real inputs.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Continue a Number Sequence cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
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 much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
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.