Advent calendar 2016

14 December

In July, I posted the Combining Multiples puzzle.
Today's number is the largest number that cannot be written in the form \(27a+17b\), where \(a\) and \(b\) are positive integers (or 0).


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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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


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