Across

1 12 across divided by seven
4 8 across times two
6 4 down plus fifty-nine
7 A prime number
8 A cube
10 Five times 9 down
12 10 down times seven
14 3 down plus 864
15 20 down minus seventy-eight
17 Eight times 9 down
19 20 down times three
21 5 down minus 110
22 13 down minus eighty-six
23 1 across plus six

Down

1 15 across times five
2 15 across plus twenty-four
3 16 down plus forty-five
4 19 across minus 189
5 4 across minus 136
9 8 across minus 105
10 7 across plus forty-eight
11 A square number
13 17 down plus sixty
16 10 across times two
17 2 down times six
18 17 across minus seventy-six
19 23 across minus twelve
20 A prime number