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Joffan

Interested in mathematical counting puzzles and many others ${\overset\infty \smile}$

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77 Prove that the equation $x^2-y^2 = 2002$ has no integer solution Mar 17 '17
52 Where does the constant increase by 2 of differences between integer square values come from? May 7 '15
51 How many subsets of set $\{1,2,\ldots,10\}$ contain at least one odd integer? Jan 15 '17
47 Every point of a grid is colored in blue, red or green. How to prove there is a monochromatic rectangle? Sep 8 '16
44 Is there a combinatorial interpretation of the triangular numbers? Oct 18 '17
41 How many pairs of numbers are there so they are the inverse of each other and they have the same decimal part? Feb 25 '17
30 How do I find the diameters of the circles in this geometry puzzle? Feb 12 '17
25 What is the sum of the $81$ products in the $9 \times 9$ multiplication grid? Jun 11 '16
24 The sum of the squares is less than or equal to the square of the sums for all n. Mar 8 '15
22 Which of the following numbers is greater? Feb 23 '17
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