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