woowawebui

for (var i = 1; i <= 9; i++) {
  for (var j = 1; j <= 9; j++) {
    console.log(i, 'X', j, '=', i * j);
  }
}

eachDan(7);
for (var i = 8; i <= 18; i += 2) eachDan(i);

printDan([3, 7, 9, 13]);