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