Number Sequence Generator
Generate arithmetic, geometric and Fibonacci sequences.
How to use
- 1 Choose a sequence type: arithmetic, geometric or Fibonacci.
- 2 Set the start value and the step (or ratio).
- 3 Enter how many terms you want to generate.
- 4 Pick a separator and copy the generated sequence.
About Number Sequence Generator
The Number Sequence Generator builds ordered lists of numbers from a few simple settings, so you never have to type out a long series by hand or fight with a spreadsheet formula.
Pick a sequence type, set the first value, choose how the numbers grow, and decide how many terms you want — the result appears instantly.
Three classic patterns are supported.
An arithmetic sequence adds a fixed step to each term, which is ideal for counting by twos, generating timestamps or laying out evenly spaced values.
A geometric sequence multiplies by a fixed ratio, perfect for powers of two, exponential growth examples or doubling schedules.
A Fibonacci-style sequence starts from any two seed values and adds the previous two terms together, useful for teaching, design grids and the famous golden-ratio progression.
You can change the separator between numbers — a comma, a space, a newline or anything else — so the output drops straight into code, a CSV, a test fixture or a maths worksheet.
Everything is computed locally in your browser, with nothing uploaded or stored, and a sensible upper limit keeps even large sequences fast and responsive.
FAQ
What is the difference between arithmetic and geometric sequences?
An arithmetic sequence adds the same step to each term, while a geometric sequence multiplies each term by the same ratio.
How many numbers can I generate?
You can generate up to 10,000 terms at once, which keeps the tool fast and your browser responsive.