A Simple Crossnumber Puzzle


+-----+-----+-----+-----+-----+-----+
|1    |     |2    |3    |OOOOO|4    |
|     |     |     |     |OOOOO|     |
|     |     |     |     |OOOOO|     |
+-----+-----+-----+-----+-----+-----+
|     |OOOOO|5    |     |     |     |
|     |OOOOO|     |     |     |     |
|     |OOOOO|     |     |     |     |
+-----+-----+-----+-----+-----+-----+
|6    |     |     |     |OOOOO|     |
|     |     |     |     |OOOOO|     |
|     |     |     |     |OOOOO|     |
+-----+-----+-----+-----+-----+-----+
|     |OOOOO|7    |     |     |     |
|     |OOOOO|     |     |     |     |
|     |OOOOO|     |     |     |     |
+-----+-----+-----+-----+-----+-----+

Across

1. The cube of a whole number.
5. The number of square inches in a square yard.
6. The number of cubic inches in a cubic foot.
7. The number of millimeters in a meter.



Down

1. A number which is unchanged if the numbers are reversed.
2. A prime number.
3. The number of feet in a mile.
4. The number of seconds in an hour.


I give up, show me the Answer


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