Each clue in this crossnumber (except 5A) gives a property of that answer that is true of no other answer. For example: 7A is a multiple of 13; but 1A, 3A, 5A, 1D, 2D, 4D, and 6D are all not multiples of 13.
No number starts with 0.
|1||The only multiple of 3.||(2)|
|3||The only number larger than 300.||(3)|
|7||The only multiple of 13.||(2)|
|1||The only square number.||(2)|
|2||The only number whose digits have product 4.||(3)|
|4||The only number whose digits add to 11.||(3)|
|6||The only number less than 20.||(2)|