A two-digit number whose sum is a prime number. Moreover, after the two-digit number is multiplied by 3, 5, and 7, the sum of the obtained numbers is still a prime number. How many two-digit numbers satisfy the condition?
一个两位数，数字和是质数．而且，这个两位数分别乘以3，5，7之后，得到的数的数字和都仍为质数，满足条件的两位数为多少．
<result>67</result>