Cycling through some motors

Anyone see anything wrong with this code? I am trying to rotate setting some motors to high/low as a test, but sometimes 3 come on, and it misses other ones. I don’t see what could be wrong with this, but I just want to make sure before I go to the lab tomorrow.

When I tried some other code that shifted through the motors with names for the motors (m1) it would work individually on all of them except for skipping some.

void setup ()
{
 pinMode(0, OUTPUT);
 digitalWrite(0, LOW);
 pinMode(1, OUTPUT);
 digitalWrite(1, LOW);
 pinMode(2, OUTPUT);
 digitalWrite(2, LOW);
 pinMode(3, OUTPUT);
 digitalWrite(3, LOW);
 pinMode(4, OUTPUT);
 digitalWrite(4, LOW);
 pinMode(5, OUTPUT);
 digitalWrite(5, LOW);

}
void loop ()
{
  for(int i = 0; i < 5; i++)
  {
    digitalWrite(i, HIGH);
    delay(1000);
    digitalWrite(i, LOW);
  }
}

Beware that digital pins 0 and 1 are also used for serial I/O to the host (via the FTDI chip). But since you're not using Serial.print(), that shouldn't matter.