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

22 December

What is the largest number which cannot be written as the sum of distinct squares?


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 Most recent collections 

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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


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