Advent calendar 2015

22 December

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


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


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