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Advent calendar 2016

10 December

The smallest number that is equal to the sum of its digits multiplied by ten more than the sum of its digits.

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

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