Randomly turning on an LED

Projects General Guidance
1

I have four LEDs hooked up to pins 7-13. I'm trying to get one to light up randomly, stay on for three seconds, then turn off and repeat the process. For some reason, the code here won't work. I am not sure why. What happens when I upload it to my Arduino goes as follows:
The fourth LED lights up, stays for three seconds, then goes off and the second LED comes on, holds for three seconds then goes off and the third goes on, repeats process, then first goes on and the whole process is repeated. I am trying to get the order of the LEDs lighting up to be completely random.

void setup() {
  // put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(11, OUTPUT);
pinMode(9, OUTPUT);
pinMode(7, OUTPUT);

pinMode(12, OUTPUT);
pinMode(10, OUTPUT);
pinMode(8, OUTPUT);

digitalWrite(12, LOW);
digitalWrite(10, LOW);
digitalWrite(8, LOW);
}

void loop() {
  start:
int const led1 = 13;
int const led2 = 11;
int const led3 = 9;
int const led4 = 7;

int const ran = random(1,5);

if(ran == 1) {
  digitalWrite(led1, HIGH);
  delay(3000);
  digitalWrite(led1, LOW);
  goto start;
  
}

if(ran == 2) {
  digitalWrite(led2, HIGH);
  delay(3000);
  digitalWrite(led2, LOW);
  goto start;
  
}

if(ran == 3) {
  digitalWrite(led3, HIGH);
  delay(3000);
  digitalWrite(led3, LOW);
  goto start;
  
}

if(ran == 4) {
  digitalWrite(led4, HIGH);
  delay(3000);
  digitalWrite(led4, LOW);
  goto start;
  
}


}
2

I don't think that you meant to declare ran as a constant.

3

Every time you start up the Arduino, the random number generator emits numbers in the same "pseudorandom" sequence.

To get different behavior each time you start, initialize the random number generator with a so-called random seed. See https://www.arduino.cc/en/Reference/RandomSeed

4

You need to do something like getting the user to press a button. While the code is waiting for the press generate random numbers. This ensures you are at a random point in the sequence.

5

Or you could do AnalogRead() on an unconnected pin and use the least significant digit , scaled appropriately, as a source of random numbers. eg

int ran= analogRead(0) % 5;