let primeList = [2, 3];

let dotSize = 4;

​

​

function setup()

{

  createCanvas(windowWidth, windowHeight);

  background(40);

  stroke(255);

  strokeWeight(dotSize);

  GeneratePrimeList();

  let oX = 0;

  let oY = windowHeight - 100;

  for (let i = 2; i < width / dotSize; ++i)

  {

    let x = oX + i * dotSize;

    let y = oY - FactorCount(i) * dotSize;

    point(x, y);

  }

}

​

​

function GeneratePrimeList()

{

  for (let p = 5; primeList.length < primeCount; p += 2)

    if (IsPrime(p))

      primeList.push(p);

}

​

​

function IsPrime(n)

{

  let sr = sqrt(n);

  for (const prime of primeList)

  {

    if (prime > sr)

      return true;

    if (n % prime === 0)

      return false;

  }

  return true;

}

​

​

function FactorCount(n)

{

  let output = 0;

  for (let i = 0; i < primeList.length; ++i)

  {

    let p = primeList[i];

    if (p > n) break;

​

    let count = 0;

​

    while (n % p === 0)

    {

      ++count;

      n /= p;

    }

​

    output += count;

  }

  return output;

}

​