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


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