Links
• Prime Numbers Home Page
• Interesting Facts about Prime Numbers
• Uses of Prime Numbers
• Theories about Prime Numbers
• Prime Number Theorem
• Twin Primes
• Sieve of Eratosthenes
• Ulam Spirals
Calculators
• 1. Find all Primes in a range
• 2. Find the Next Prime Number
• 3. Factor a Number
• 4. Find twin Primes
• 5. Create your own Ulam Spiral

Twin Primes

Twin primes are pairs of primes which differ by two. The first twin primes are 3,5 5,7, 11,13 and 17,19. It has been conjectured, but not proven to date, that there are infinitely many twin primes.

Read more about twin primes here...

This calculator allows search allows you to find all twin prime in a range.