Advent calendar 2015

15 December

If the numbers 1 to 7 are arranged 7,1,2,6,3,4,5 then each number is either larger than or a factor of the number before it.
How many ways can the numbers 1 to 7 be arranged to that each number is either larger than or a factor of the number before it?


Show me a random puzzle
 Most recent collections 

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

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2019