function isSumInArray(numbers, n) {
  if (isNaN(n) || !numbers || !Array.isArray(numbers)) {
    return undefined;
  }

  var outerIndex = -1,
      flag = false,
      length = numbers.length;

  while (++outerIndex < length && !flag) {
    var innerIndex = outerIndex,
        value = Number(numbers[outerIndex]);

    while(!isNaN(value) && ++innerIndex < length && !flag) {
      flag = (value + Number(numbers[innerIndex])) == n;
      console.log(value + ', ' +  Number(numbers[innerIndex]) + ': ' + (value + Number(numbers[innerIndex])));
    }
  }

  return flag;
}