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


Advent calendar 2017

24 December

Today's number is the smallest number with exactly 28 factors (including 1 and the number itself as factors).

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


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