Arduino - RGB dioda

void setup() {

}

void loop() {
  for(int i=80; i < 150; i += 10) {
    for(int j=10; j < 150; j += 10) {
      for(int k=10; k < 150; k += 10) {
          analogWrite(4, i);
          analogWrite(5, j);
          analogWrite(6, k);
          delay(100);
      }
    }
  }
}