code: function getSimilarMcis(mci){
  	var arrSimilarMcis = [];
  	var divisor = 10;
  	while (true){
  		if (mci % divisor === 0){
  			arrSimilarMcis.push(mci - divisor);
  			divisor *= 10;
  		}
  		else
  			return arrSimilarMcis;
  	}
  }
docs: returns list of past MC indices for skiplist