int bilangan = 10;
int hasil;

void setup() {
    Serial.begin(9600);
    for(int i = 1; i <= bilangan; i++){
      hasil = hasil + (i*i);
      Serial.print(" ("+String(i)+"*"+String(i)+") ");
      if(i == bilangan){
        Serial.print("= ");
      } else {
         Serial.print("+");
      }
    }
    Serial.print(hasil);
}

void loop() {
    // put your main code here, to run repeatedly
}