int led = 13;
unsigned long rngstate = 4678678;

void setup() {
  pinMode(led, OUTPUT);
}

void on(int ms) {
  digitalWrite(led, HIGH);
  delay(ms);
}
void off(int ms) {
  digitalWrite(led, LOW);
  delay(ms);
}
void mid(int ms) {
  for(int counter = 0; counter != ms; ++counter) {
    if(counter % 2 == 0) {
      digitalWrite(led, HIGH);
    }
    else {
      digitalWrite(led, LOW);
    }
    delay(1);
  }
}
//void level(int percentIntensity, int ms) {
//  
//  for(int counter = 0; counter != ms; ++counter) {
//    if(counter % 100 < percentIntensity) {
//      digitalWrite(led, HIGH);
//    }
//    else {
//      digitalWrite(led, LOW);
//    }
//    delay(1);
//  }
//}

void loop() {
  rngstate = rngstate * 1664525 + 1013904223;
  on(500);
  off(50);
  on(500);
  for(int i = 0; i != ((rngstate >> 10) % 13) + 4; ++i) {
    on(150);
    mid(150);
    off(150);
  }
  delay(350);
}