Random number generator

I am trying to use this code to create a random number generator that will flash an led if it gets a certain number but it isnt working. It is only flashing the red led really fast constantly.

int randomnum;
#define RED 3
#define BLUE 4
void setup() {
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
Serial.begin(9600);
randomSeed(analogRead(0));
}

void loop() {
digitalWrite(BLUE,HIGH);
randomnum = random(50);

{
if (randomnum == 25);
{
Serial.println(randomnum);
digitalWrite(BLUE,LOW);
delay(20);
digitalWrite(RED, HIGH);
delay(10);
digitalWrite(RED,LOW);
}
}
}

When posting code, please use code tags.
Type
** **[code]** **
before your code
Type
** **[/code]** **
after your code

Also before posting code, use tools -> auto-format in the IDE to format your code. I've done it for you and the result is the below code window

int randomnum;
#define RED 3
#define BLUE 4
void setup()
{
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  Serial.begin(9600);
  randomSeed(analogRead(0));
}

void loop()
{
  digitalWrite(BLUE, HIGH);
  randomnum = random(50);

  {
    if (randomnum == 25);
    {
      Serial.println(randomnum);
      digitalWrite(BLUE, LOW);
      delay(20);
      digitalWrite(RED, HIGH);
      delay(10);
      digitalWrite(RED, LOW);
    }
  }
}
    if (randomnum == 25);

The semicolon at the end ends the if block. So the below is always executed

    {
      Serial.println(randomnum);
      digitalWrite(BLUE, LOW);
      delay(20);
      digitalWrite(RED, HIGH);
      delay(10);
      digitalWrite(RED, LOW);
    }

Get rid of that semicolon and take it from there.

If you want so,etching to flash you have to turn it on and then off. A delay of 10mS is too small to see effectively at this space rate.