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Comments in green were written by me. Comments in blue were not written by me.
2025-12-24
@
Chad
: What was your wrong answer for #15? I had that one wrong too at first, and it took a kind of sneaky "Oh of course!" insight for me to figure it out.
Seth Cohen
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/blog/120
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A bad Puzzle for Today
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Assorted christmaths
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"Uncanny" royal coincidence
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Archive
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Feb 2026
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2025
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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
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Christmas (2024) is coming!
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Zines, pt. 2
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Logo Asteroids
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Mathsteroids on hyperbolic surfaces
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The databet
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Christmas (2022) is over
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▼ show ▼
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Dec 2022
Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
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24 Hour Maths Game Show
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Approximating π
Feb 2022
Build your own MENACE
Jan 2022
Christmas (2021) is over
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Dec 2021
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Nov 2021
Christmas (2021) is coming!
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TMiP 2021 puzzle hunt
May 2021
Close encounters of the second kind
Jan 2021
Christmas (2020) is over
2020
▼ show ▼
▲ hide ▲
Dec 2020
Christmas card 2020
Nov 2020
Christmas (2020) is coming!
Jul 2020
Happy -3+τ-φ Approximation Day!
May 2020
A surprising fact about quadrilaterals
Interesting tautologies
Mar 2020
Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2
Jan 2020
PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
2019
▼ show ▼
▲ hide ▲
Dec 2019
Visualising MENACE's learning
Christmas card 2019
Nov 2019
Christmas (2019) is coming!
Sep 2019
A non-converging LaTeX document
TMiP 2019 treasure punt
Jul 2019
Big Internet Math-Off stickers 2019
Jun 2019
Proving a conjecture
Apr 2019
Harriss and other spirals
Mar 2019
realhats
Jan 2019
Christmas (2018) is over
2018
▼ show ▼
▲ hide ▲
Dec 2018
Christmas cross stitch
MENACE in fiction
Christmas card 2018
Nov 2018
Christmas (2018) is coming!
Sep 2018
Runge's Phenomenon
Jul 2018
World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
May 2018
A bad Puzzle for Today
Apr 2018
Building MENACEs for other games
Mar 2018
A 20,000-to-1 baby?
World Cup stickers 2018
Jan 2018
Origins of World War I
Christmas (2017) is over
2017
▼ show ▼
▲ hide ▲
Dec 2017
Christmas card 2017
Nov 2017
Christmas (2017) is coming!
MENACE at Manchester Science Festival
Jun 2017
Big Ben Strikes Again
Mar 2017
The end of coins of constant width
Dragon curves II
Feb 2017
The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
▼ show ▼
▲ hide ▲
Dec 2016
Christmas (2016) is over
Video game surfaces
Christmas card 2016
Nov 2016
Christmas (2016) is coming!
Oct 2016
Logical contradictions
Palindromic dates
Sep 2016
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
2014
▼ show ▼
▲ hide ▲
Nov 2014
Logic bot
Sep 2014
Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
Apr 2014
Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
New machine unfriendly £1 coin
2013
▼ show ▼
▲ hide ▲
Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
▼ show ▼
▲ hide ▲
Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
frobel
palindromes
game show probability
craft
tennis
countdown
fractals
final fantasy
rugby
logs
oeis
wool
signorini conditions
video games
games
pizza cutting
geometry
crochet
trigonometry
menace
matrix multiplication
alphabets
football
friendly squares
christmas
misleading statistics
tmip
hats
ucl
pokémon
weather station
approximation
errors
graphs
noughts and crosses
inline code
edinburgh
fence posts
hexapawn
european cup
braiding
pac-man
reddit
captain scarlet
wave scattering
mathsjam
datasaurus dozen
squares
map projections
bots
books
bempp
probability
arithmetic
numerical analysis
24 hour maths
graph theory
newcastle
dataset
dinosaurs
hannah fry
live stream
kenilworth
gather town
matrices
programming
sobolev spaces
crossnumbers
folding tube maps
national lottery
bodmas
triangles
gaussian elimination
accuracy
pi
stickers
thirteen
nonograms
people maths
kings
ternary
regular expressions
inverse matrices
php
estimation
light
london
simultaneous equations
machine learning
geogebra
bluesky
manchester
dates
runge's phenomenon
wordle
warwick
asteroids
databet
arrangement puzzles
statistics
cambridge
phd
coins
tetris
zines
partridge puzzle
world cup
anscombe's quartet
mathslogicbot
golden spiral
data visualisation
the aperiodical
big internet math-off
pi approximation day
fonts
standard deviation
error bars
radio 4
convergence
dragon curves
matrix of minors
mean
finite element method
boundary element methods
royal baby
puzzles
gerry anderson
turtles
sorting
interpolation
curvature
christmas card
platonic solids
data
pascal's triangle
london underground
python
correlation
speed
nine men's morris
harriss spiral
quadrilaterals
golden ratio
logic
chalkdust magazine
news
stirling numbers
guest posts
bubble bobble
go
folding paper
mathsteroids
cross stitch
preconditioning
draughts
sport
pokémon wordle
chebyshev
determinants
game of life
hyperbolic surfaces
advent calendar
a gamut of games
javascript
numbers
plastic ratio
royal institution
propositional calculus
manchester science festival
electromagnetic field
crosswords
rhombicuboctahedron
realhats
recursion
talking maths in public
chess
rust
coventry
latex
sound
crossnumber
youtube
logo
finite group
exponential growth
matrix of cofactors
binary
computational complexity
martin gardner
matt parker
flexagons
weak imposition
pythagoras
reuleaux polygons
raspberry pi
polynomials
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