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 31

Crossnumber 4

ACROSS

2. A power of two (4)

5. A prime factor of 12345 (3)

6. Six more than a multiple of 13 ACROSS (3)

8. A cube (2)

10. The product of the digits of 25 ACROSS and also less than half of 23 ACROSS (2)

11. The mean of 4 DOWN, 8 ACROSS, 10 ACROSS, 13 ACROSS and 20 ACROSS and more than 3 DOWN (2)

13. A Fibonacci number (2)

14. A multiple of seven (3)

17. Eight less than a square (3)

19. Seven less than 26 DOWN (2)

20. A number that is greater than 3 DOWN and less than 27 DOWN (2)

22. An even number that is the sum of a square and a triangular number in two different ways (2)

23. A prime whose digits add up to five (2)

25. A square and a multiple of five (3)

28. A multiple of 14 that includes a two and an eight among its digits (3)

29. Nine more than a power of 20 ACROSS (4)

DOWN

1. One hundred and ninety-five less than a square (4)

2. One less than a Fibonacci number (3)

3. The highest common factor of 9 DOWN and 15 DOWN (2)

4. The sum of two powers of two (2)

6. (25 ACROSS) per cent of 24 DOWN (3)

7. The shortest side of a right-angled triangle whose longer sides are 24 DOWN and 25 ACROSS (3)

9. The square of a triangular number; also one less than a multiple of five (3)

12. A factor of 732, each of whose digits is a power of two (3)

15. Five multiplied by 3 DOWN (3)

16. An even square; also a multiple of 8 ACROSS (3)

17. A multiple of 17, the product of whose digits is a square multiplied by seven (3)

18. A multiple of nine (3)

21. A power of 21 (4)

24. A factor of 360 (3)

26. Seven more than 19 ACROSS (2)

27. A cube (2)

[SOLUTION]