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

14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?


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


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