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Advent calendar 2018

9 December

Today's number is the number of numbers between 10 and 1,000 that contain no 0, 1, 2 or 3.

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Advent calendar 2019

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Advent calendar 2018

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Cryptic crossnumber #2

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

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