int leds[]= {13, 12, 11, 10, 9};
int Zahl;

void setup(){
  Serial.begin(9600);
  for (int i=0; i<5; i=i+1) {
  pinMode(leds[i], OUTPUT);
  randomSeed(66);
  }
}
void loop(){
Zahl=random(0, 5);
digitalWrite(leds[Zahl], HIGH);
delay(200);
digitalWrite(leds[Zahl], LOW);
Serial.println(Zahl);
delay(200);
}