mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2018

11 December

Today's number is the number \(n\) such that $$\frac{216!\times215!\times214!\times...\times1!}{n!}$$ is a square number.

Show answer

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020