int beep=13;
void setup()
{
  Serial.begin(9600);
  pinMode(beep, OUTPUT);
}

void Beep();
void SerialPrint();

//**************************************
void loop()
{
  int n=10000;
  for (int i=10; i<n; i+=10)
  {
    for(int j=0;j<(n-i)/10;j++)
    {
    Beep(i);
    //SerialPrint(n,i,j);
    }
  }
}
//*************************************

void Beep(int P)
{
  digitalWrite(beep, HIGH);   // turn the LED on (HIGH is the voltage level)
  delayMicroseconds(P);
  //delay(P);                       // wait for a second
  digitalWrite(beep, LOW);    // turn the LED off by
  //delay(P);                       // wait for a second
  delayMicroseconds(P);
}

void SerialPrint(int N, int I, int J)
{
    Serial.print (N);
    Serial.print ("_");
    Serial.print (I);
    Serial.print ("_");
    Serial.println (J);
}