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Advent calendar 2017

18 December

Today's number is the maximum number of pieces that a (circular) pancake can be cut into with 17 straight cuts.

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

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