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Advent calendar 2016

18 December

The smallest number whose sum of digits is 25.

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

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