Prime & Composite Numbers Explorer

Instructions:

  1. Click or tap numbers to toggle between: Number (default) → Prime (Yellow) → Composite (Gray)
  2. Start by eliminating every second number after 2 (all multiples of 2)
  3. Then eliminate every third number after 3 (all multiples of 3)
  4. Then eliminate every fourth number after 4 (all multiples of 4)
  5. Then eliminate every fifth number after 5 (all multiples of 5)
  6. Then eliminate every sixth number after 6 (all multiples of 6)
  7. Then eliminate every third number after 7 (all multiples of 7)
Default
Prime
Composite

Click "Start Tutorial" to begin learning about prime and composite numbers!