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


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


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