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Number Sequence Generator

Build arithmetic and geometric number sequences from a first term and a rule.

Generate a number sequence

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Sequences are built locally in your browser, up to two hundred terms.

How to use the Number Sequence Generator

  1. Choose an arithmetic or geometric sequence.
  2. Set the first term, the difference or ratio, and the term count.
  3. Click Build sequence and copy the list if you need it.

Features

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Frequently Asked Questions

Common questions about the free online number sequence generator.

Choose arithmetic or geometric, set the first term and the difference or ratio, then pick how many terms you need.
An arithmetic sequence adds the same difference to every term, so the numbers grow by a fixed amount each step.
A geometric sequence multiplies every term by the same ratio, so the numbers grow or shrink by a fixed factor.
Yes. The result panel also shows the sum of all generated terms and the total number of terms produced.
Yes. Negative numbers and decimals work for the first term, for the difference or ratio, and for the term count.
No. The sequence is built locally in your browser and nothing you type is uploaded anywhere.
Yes. The generator is responsive and works in any modern browser on a phone, tablet or desktop.
Yes. It is completely free with no account, no sign-up and no limit on how many sequences you build.

Last updated: October 10, 2026