**From New Scientist #1079, 24th November 1977** [link]

**Across:**

1. Three of these digits are those of 6 across, not necessarily in the same order, and the other one is the sum of the digits of 6 across.

5. A multiple of the square root of 7 down.

6. A perfect cube.

8. A multiple of 23.

9. This is a prime number when reversed.

10. Each digit is greater than the one before.

12. The sum of the digits is 12.

**Down:**

1. The sum of the digits of this number is the same as the sum of the digits of 3 down.

2. The same when reversed.

3. See 1 down.

4. Each digit is greater than the one before.

7. A perfect square.

8. A multiple of 19.

11. A prime number.

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