Prime Number Generator
List the first N primes — or primes up to a limit.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Prime Number Generator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Choose a mode: 'First N primes' or 'Primes up to limit'.
- 2
Step 2. Enter N (e.g. 100) or an upper bound (e.g. 1000).
- 3
Step 3. See the list with copy-to-clipboard, plus the count and largest prime.
Why use this tool
Frequently asked questions
Everything you might want to know about prime number generator.
Prime Number Checker
Is a number prime? Instant yes/no with factor if composite.
Prime Factorization Calculator
Break any integer into its prime factors — 2² × 3 × 5, etc.
Fibonacci Generator
Generate the first N Fibonacci numbers — arbitrary precision.
GCF & LCM Calculator
Greatest common factor and least common multiple of any integers.