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Advent calendar 2015

22 December

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

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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

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