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


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