getRandomNumber

(function(count) {
  var resultSet = [];
  function getRandom() {
	var randomNumber = Math.floor(Math.random()*count)+1;
    if(resultSet.indexOf(randomNumber) === -1) {
       resultSet.push(randomNumber);
       if(resultSet.length < count) getRandom();
       return;
    }
    getRandom();
  }
  getRandom();
  console.log(resultSet);  
})(23);