void setup() {
  pinMode(13, OUTPUT);  // Set pin 13 as an output
}

void loop() {
  // Blink 5 times, increasing the delay each time
  for (int i = 1; i <= 5; i++) {
    digitalWrite(13, HIGH);
    delay(i * 100);  // Delay increases by 100ms each iteration
    digitalWrite(13, LOW);
    delay(500);  // Consistent off time
  }
  
  delay(2000);  // Pause before repeating the sequence
}