Sure! You can type any number up to 10,000,000,000 and it will show up to 10,000 consecutive numbers.

Color key:

Prime or 1 = Purple

Divisible by 2 = pink

Divisible by 3 = green

Divisible by 5 = blue

Divisible by 7 = yellow

Composite number = gray

Clicking any color will other than prime will turn any numbers with that factor gray.

Thanks. Is the choice of using different colors only up to 7 an arbitrary choice or is the result of some particular property/theory?

Good question. The first of the odd primes up to 7 occur as the most frequent factors, other than 2. So 3,5,7 are most often reoccurring. Because of the patterns they illustrate especially when modulating the columns it seemed to make sense.

While all of that is true, the original concept for the project was based off the Sieve of Eratosthenes.

http://simple.wikipedia.org/wiki/Eratosthenes#Other_discover...

Hehe I asked because time ago I implemented something similar (using console though) and by instinct I was doing the same, coloring numbers based on divisors to see patterns, and primes, but just when I wanted to get some conclusion out that, I had to stop and do something else, so it kinda remained in my brain as something I had to finish to consciously understand.

Thanks for explaining then, so what we did is a Sieve of Eratosthenes... But I have to admit that I also coded it to see which particular patterns (if any) primes were drawing on screen.. :)