void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  randomSeed(analogRead(0)); 
}

void loop() {
  int bilangan = random(1, 500); 

  if (bilangan % 7 == 0) {
    Serial.print("Ketemu!!! Bilangan ");
    Serial.print(bilangan);
    Serial.println(" habis dibagi 7");
    while (true) {} 
  }
}