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Advent calendar 2017

7 December

The odd numbers are written in a pyramid.
What is the sum of the numbers in the seventh row?
Tags: numbers

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

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