Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.


Advent calendar 2015

5 December

How many different triangles are there with a perimeter of 100 and each side having an integer length?
(different = not rotations or reflections)


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 Most recent collections 

Sunday Afternoon Maths LXVII

Coloured weights
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Cryptic crossnumber #2

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Cryptic crossnumber #1
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3d shapes dates sum to infinity proportion factorials trigonometry grids digits perfect numbers triangles star numbers quadratics time unit fractions lines dice folding tube maps circles mean chess integration regular shapes differentiation indices rectangles odd numbers balancing coordinates polygons hexagons squares logic scales averages rugby triangle numbers wordplay cards parabolas palindromes irreducible numbers christmas 2d shapes clocks remainders chocolate area ellipses ave games perimeter cryptic clues factors algebra numbers geometry percentages number division spheres square roots means angles sequences partitions crosswords surds probabilty planes coins taxicab geometry square numbers shape complex numbers calculus advent crossnumbers colouring sport money graphs doubling prime numbers books multiples dodecagons speed integers chalkdust crossnumber symmetry functions probability shapes addition arrows sums volume routes cryptic crossnumbers floors bases cube numbers fractions people maths pascal's triangle multiplication menace


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