void setup() {
  int i;
  Serial.begin(9600);
  Serial.println(" Dec  Oct  Hex   Bin ");
  for (i=1; i<=20; i++)
{
Serial.print(i);
Serial.print("     ");
Serial.print(i, OCT);
Serial.print("     ");
Serial.print(i, HEX);
Serial.print("     ");
Serial.print(i, BIN);
delay(1000);
}
}
void loop() {
  // put your main code here, to run repeatedly:

}