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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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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


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© Matthew Scroggs 2019