Advent calendar 2018

5 December

I make a book by taking 111 sheets of paper, folding them all in half, then stapling them all together through the fold. I then number the pages from 1 to 444.
Today's number is the sum of the two page numbers on the centre spread of my book.
Tags: numbers, books


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


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