Sequence Generator
Generate arithmetic, geometric, and custom number sequences with sums. Fill spreadsheets and test series — free, local, no signup.
How to Use the Sequence Generator
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Frequently Asked Questions
Which sequences?
Arithmetic (+step), geometric (×ratio), and custom (n + n×r) progressions with sum totals. Test data and homework both covered.
How long can sequences be?
Hundreds of terms per run locally. Million-term series belong in scripts with streaming output.
Custom steps?
Yes — start, step, and count define any linear series. Geometric needs ratio instead of step.
Do series numbers upload?
No — generation runs locally in your browser. Nothing leaves your device.
What does the Even Numbers preset output?
Start 2, step 2, count 10 gives 2, 4, through 20 with the panel reporting sum 110 and count 10. Geometric mode multiplies by the ratio instead; Custom uses n + n x r.
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Last updated October 2026