mscroggs.co.uk

mscroggs.co.uk

blog puzzles academic talks contact subscribe ↓ ☰ ↓

Comment

Comments

Comments in green were written by me. Comments in blue were not written by me.

2019-01-04

@Jose: There is a mistake in your answer: 243 (0100000) is the number of numbers between 10,000 and 100,000 that do not contain the digits 0, 1, 2, 3, 4, 5, or 6.

Matthew
on /blog/47

Archive

Show me a random blog post

2026

May 2026

World Cup stickers 2026

Apr 2026

A new puzzle every day
Mixing Wordle with other games

Feb 2026

Christmas (2025) is over

2025

Dec 2025

Christmas card 2025

Nov 2025

Christmas (2025) is coming!

Sep 2025

The partridge puzzle

Aug 2025

TMiP 2025 puzzle hunt

Jun 2025

A nonogram alphabet

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares

2024

Dec 2024

A regular expression Christmas puzzle
Christmas card 2024

Nov 2024

Christmas (2024) is coming!

Feb 2024

Jan 2024

Christmas (2023) is over

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Tags

wordle squares tetris arithmetic hats world cup pokémon wordle advent calendar london underground mean inverse matrices coins runge's phenomenon latex pascal's triangle bubble bobble logo a gamut of games error bars nine men's morris zines logs databet asteroids curvature correlation palindromes recursion folding tube maps dataset bots go menace flexagons pac-man braiding realhats edinburgh crosswords bluesky chebyshev arrangement puzzles news the aperiodical golden ratio draughts gaussian elimination triangles quadrilaterals partridge puzzle probability gerry anderson standard deviation games hannah fry crossnumbers misleading statistics phd finite group exponential growth finite element method mathsteroids turtles interpolation london books cambridge sobolev spaces hyperbolic surfaces noughts and crosses estimation programming oeis numbers nonograms craft alphabets php regular expressions gather town dates chess newcastle matt parker sound convergence pizza cutting big internet math-off pi reddit numerical analysis kings royal baby light tennis cross stitch harriss spiral coventry chalkdust magazine data visualisation stirling numbers javascript sorting youtube datasaurus dozen golden spiral raspberry pi anscombe's quartet ucl royal institution wool captain scarlet graphs reuleaux polygons python computational complexity frobel crochet mathslogicbot plastic ratio thirteen dragon curves warwick football logic binary martin gardner accuracy matrices puzzles pi approximation day countdown signorini conditions data fractals matrix multiplication machine learning folding paper speed wave scattering pythagoras mathsjam game of life fence posts preconditioning tmip friendly squares final fantasy manchester european cup 24 hour maths trigonometry manchester science festival geometry weak imposition guest posts rhombicuboctahedron dinosaurs map projections national lottery stickers matrix of minors christmas card hexapawn inline code graph theory determinants game show probability sport fonts rust christmas crossnumber talking maths in public bempp kenilworth propositional calculus electromagnetic field live stream ternary approximation pokémon boundary element methods simultaneous equations errors people maths video games bodmas matrix of cofactors rugby platonic solids statistics weather station polynomials radio 4 geogebra

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026