int a=3;
int t=120;
int i=3;

void setup() {  
  // put your setup code here, to run once:
while (i<9){
pinMode(i, OUTPUT);
i=i+1;
}
}

void loop() {
  // put your main code here, to run repeatedly:
while (a<9){
digitalWrite(a,HIGH);
delay(t);
digitalWrite(a,LOW);
delay(t);

a=a+1;
}
}