let c = 8;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(0);

  angleMode(DEGREES);

  colorMode(HSB);

}

​

function draw() {

  let a1 = 137.5;

  let r = c * sqrt(n);

  let a = n * a1;

  let x = r * cos(a) + width / 2;

  let y = r * sin(a) + height / 2;

  fill(r % 360, 50, 100);

  noStroke();

  ellipse(x, y, c);

  n += 1;

}