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Comments in green were written by me. Comments in blue were not written by me.
2025-12-17
Many thanks for your puzzle again this year - I suspect I have run into a similar contradiction to Bob. It may be an interpretation issue. When you say that the answer is not a factor, do you mean any factor or one particular factor?
Larry
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Interesting tautologies
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Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
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PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
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A non-converging LaTeX document
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A bad Puzzle for Today
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World Cup stickers 2018
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Christmas (2017) is over
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Big Ben Strikes Again
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The end of coins of constant width
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The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
▼ show ▼
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Video game surfaces
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Christmas (2016) is coming!
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Logical contradictions
Palindromic dates
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Tube map kaleidocycles
Jul 2016
Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
May 2016
Euro 2016 stickers
Mar 2016
Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
▼ show ▼
▲ hide ▲
Nov 2015
Christmas (2015) is coming!
Oct 2015
How to kick a conversion
How much will I win on the new National Lottery?
Aug 2015
How OEISbot works
MENACE
Mar 2015
Optimal Pac-Man
Tube map stellated rhombicuboctahedron
Logic bot, pt. 2
Design your own flexagon
Jan 2015
Tube map Platonic solids, pt. 3
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▼ show ▼
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Logic bot
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Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
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Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
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2013
▼ show ▼
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Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
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Nov 2012
Tube map Platonic solids, pt. 2
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Tube map Platonic solids
Tags
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edinburgh
quadrilaterals
news
manchester
squares
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folding tube maps
radio 4
countdown
fence posts
triangles
javascript
guest posts
ucl
bluesky
coventry
golden ratio
nine men's morris
national lottery
hexapawn
signorini conditions
cambridge
raspberry pi
zines
probability
gaussian elimination
graph theory
big internet math-off
go
statistics
advent calendar
matrix of cofactors
sport
accuracy
christmas
databet
geogebra
sobolev spaces
pizza cutting
exponential growth
trigonometry
tmip
graphs
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24 hour maths
approximation
phd
convergence
chalkdust magazine
light
regular expressions
tetris
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martin gardner
numerical analysis
chebyshev
crossnumber
matrix of minors
books
php
friendly squares
the aperiodical
arithmetic
errors
noughts and crosses
rhombicuboctahedron
fractals
propositional calculus
manchester science festival
asteroids
rugby
bubble bobble
fonts
partridge puzzle
mathsjam
football
tennis
european cup
games
menace
data
braiding
royal institution
logs
pi approximation day
stirling numbers
bempp
pascal's triangle
crochet
dragon curves
logic
speed
mathsteroids
weak imposition
world cup
electromagnetic field
gather town
frobel
runge's phenomenon
video games
rust
matrices
draughts
reuleaux polygons
folding paper
newcastle
machine learning
geometry
hannah fry
chess
python
talking maths in public
hyperbolic surfaces
preconditioning
golden spiral
map projections
people maths
finite element method
london
a gamut of games
inline code
plastic ratio
palindromes
pac-man
royal baby
inverse matrices
turtles
cross stitch
pokémon wordle
logo
arrangement puzzles
thirteen
finite group
matt parker
christmas card
pi
wave scattering
kings
dates
mathslogicbot
misleading statistics
reddit
flexagons
final fantasy
realhats
standard deviation
london underground
curvature
craft
wool
coins
harriss spiral
platonic solids
alphabets
sorting
pokémon
datasaurus dozen
oeis
kenilworth
estimation
captain scarlet
pythagoras
boundary element methods
programming
dataset
recursion
numbers
sound
anscombe's quartet
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simultaneous equations
gerry anderson
stickers
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bodmas
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