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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026