Generate Gijswijt Numbers
Calculate a sequence of self-describing Gijswijt numbers. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate Gijswijt Numbers
- 1. Choose the sequence length. Set How many terms to the number of Gijswijt values you want, counting from the very first term of the sequence.
- 2. Understand the self-describing rule. Each term counts how many times the longest run at the end of the sequence so far has repeated as a block; the sequence rereads itself term by term to decide the next value.
- 3. Pick a separator. Set Separator to whatever delimiter your destination expects, a comma for prose or a newline for a text file of one term per line.
- 4. Copy the sequence. Copy the generated terms into a spreadsheet, a research note or a script that studies A090822's slow logarithmic growth.
When to use Generate Gijswijt Numbers
Generate Gijswijt Numbers produces the curling-number sequence A090822, known for growing so slowly that early terms barely hint at its long-term structure. Use this tool instead of hand-tracing the self-referential rule term by term, which gets error-prone past the first dozen values.
- Studying a self-referential sequence. A recreational mathematics blog post about slow-growing integer sequences needs the first fifty Gijswijt numbers to plot against term index and show how rarely the value increases.
- Cross-checking a homemade implementation. Someone wrote their own curling-number calculator in Python and wants a known-good reference list of the first thirty terms to diff against their output.
- Preparing a talk on OEIS oddities. A conference lightning talk on unusual OEIS sequences cites Gijswijt's number as an example of deceptively slow growth and needs a concrete printed list of terms for the slides.
Examples
The first nineteen numbers
Output
1, 1, 2, 1, 1, 2, 2, 2, 3, 1, 1, 2, 1, 1, 2, 2, 2, 3, 2
About the Generate Gijswijt Numbers tool
Generate Gijswijt Numbers does its work locally, right in the browser. Calculate a sequence of self-describing Gijswijt numbers. 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 Gijswijt 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.