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