Читать книгу The Ultimate Mathematical Challenge: Over 365 puzzles to test your wits and excite your mind - Литагент HarperCollins USD, F. M. L. Thompson - Страница 37

Crossnumber 5

ACROSS

1. The cube of a square (5)

4. Eight less than 5 DOWN (3)

6. One less than a multiple of seven (3)

7. A prime factor of 20 902 (4)

10. A number whose digits successively decrease by one (3)

12. Sixty per cent of 20 DOWN (3)

14. A multiple of seven (3)

15. A multiple of three whose digits have an even sum (3)

16. The square of a square (3)

17. A prime that is one less than a multiple of six (3)

19. Eleven more than a cube (4)

22. A number all of whose digits are the same (3)

24. A number that leaves a remainder of eleven when divided by thirteen (3)

25. The square of a prime; the sum of the digits of this square is ten (5)

DOWN

1. A number with an odd number of factors (3)

2. Four less than a triangular number (3)

3. The square root of 9 DOWN (2)

4. A factor of 12 ACROSS (3)

5. The longest side of a right-angled triangle whose shorter sides are 3 DOWN and 4 ACROSS (3)

8. A Fibonacci number (5)

9. The square of 3 DOWN (4)

11. Three more than an even cube (5)

13. A prime factor of 34567 (4)

17. The mean of 10 ACROSS, 16 ACROSS, 18 DOWN, 20 DOWN and 21 DOWN (3)

18. A power of eighteen (3)

20. Two less than 22 ACROSS (3)

21. A number whose digits are those of 12 ACROSS reversed (3)

23. A multiple of twenty-three (2)

[SOLUTION]