13. In a restaurant, there are two types of tables: square tables can seat 4 people, and round tables can seat 9 people. If the number of diners can exactly fill a certain number of tables, the restaurant manager calls this number a "Fortune Number." Among the numbers from $1 \sim 100$, there are $\qquad$ "Fortune Numbers".
【Analysis】 88
Classified by the remainder when divided by 9:
$9 a$ type (remainder 0 when divided by 9): 11
$9 a+4$ type (remainder 4 when divided by 9): 11
$9 a+8$ type (remainder 8 when divided by 9): 11
9 - 12 type (remainder 3 when divided by 9): 10
$9 a+16$ type (remainder 7 when divided by 9): 10
$9 a+20$ type (remainder 2 when divided by 9): 9
$9 a+24$ type (remainder 6 when divided by 9): 9
$9 a+28$ type (remainder 1 when divided by 9): 9
$9 a+32$ type (remainder 5 when divided by 9): 8
Total $11+11+11+10+10+9+9+9+8=88$.