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 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025