Number Range Generator
Build a list from start to end with a step size. Optionally keep only evens, odds, or primes.
Number Range Generator
Generate sequences of numbers with custom ranges, steps, and filters
Quick Examples
Common Use Cases
Programming Applications
Loop Initialization
Generate ranges for for-loops, array indexing, and iteration patterns. Useful for creating test data and initializing arrays with sequential values.
Test Data Generation
Create large sets of test numbers for unit tests, performance testing, and algorithm validation. Export to various formats for different tools.
Database Seeding
Generate ID sequences, pagination ranges, and sample numeric data for database population and migration testing.
Configuration Values
Create ranges for configuration parameters, port numbers, timeout values, and other numeric settings.
What you get
- Inclusive or exclusive ends, depending on the controls
- Positive or negative step (count up or down)
- Optional filters: even, odd, divisible by n, primes
Same idea as a programming range: start, stop, step — then dump the list for tests, loops, or worksheets.
Typical uses
- Sample IDs or indexes for scripts
- Homework: multiples in an interval
- Quick lists for charts or Monte Carlo setups
Watch the bounds
- Huge spans with step 1 can make long lists — use a larger step or narrower window
- Prime filters slow down on wide ranges
- Confirm whether the end value is included before you copy
Frequently Asked Questions
What is a step size?
How far to jump each time. Step 2 from 1 → 1, 3, 5… Step −1 counts down.
Can I generate only even or odd numbers?
Yes — use the even/odd filter, or set start and step accordingly (e.g. start 2, step 2).
Does it include the end number?
Depends on the inclusive/exclusive setting in the tool. Check the option before exporting.
Can I filter primes?
If the UI exposes a prime filter, yes. Wide ranges take longer.
Is there a size limit?
Very large lists can strain the browser. Narrow the range or increase the step.
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