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Comments in green were written by me. Comments in blue were not written by me.
2025-12-25
@
Aisha
: Hm, I used exactly the same method for both of these days. I'm not sure if it lends itself to a nice clean formula, but it might! I'll share my approach after the contest is over!
Seth Cohen
on
/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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Tube map Platonic solids, pt. 2
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Tube map Platonic solids
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Archive
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2026
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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
Christmas card 2024
Nov 2024
Christmas (2024) is coming!
Feb 2024
Zines, pt. 2
Jan 2024
Christmas (2023) is over
2023
▼ show ▼
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Dec 2023
Christmas card 2023
Nov 2023
Christmas (2023) is coming!
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Sep 2023
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Chalkdust issue 17
Apr 2023
Logo Asteroids
Mar 2023
Mathsteroids on hyperbolic surfaces
Feb 2023
The databet
Jan 2023
Christmas (2022) is over
2022
▼ show ▼
▲ hide ▲
Dec 2022
Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
Oct 2022
24 Hour Maths Game Show
Mar 2022
Approximating π
Feb 2022
Build your own MENACE
Jan 2022
Christmas (2021) is over
2021
▼ show ▼
▲ hide ▲
Dec 2021
Christmas card 2021
Nov 2021
Christmas (2021) is coming!
Sep 2021
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 -26+eg 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
runge's phenomenon
game of life
zines
harriss spiral
christmas card
games
bots
fence posts
folding tube maps
inverse matrices
noughts and crosses
raspberry pi
the aperiodical
asteroids
reddit
bempp
rhombicuboctahedron
rugby
alphabets
mean
anscombe's quartet
speed
dates
matrix of minors
matrix multiplication
triangles
matrices
chess
sorting
royal baby
warwick
electromagnetic field
datasaurus dozen
arithmetic
bodmas
a gamut of games
geogebra
mathslogicbot
regular expressions
signorini conditions
martin gardner
programming
logo
pizza cutting
phd
draughts
interpolation
gaussian elimination
chalkdust magazine
youtube
talking maths in public
recursion
realhats
chebyshev
convergence
numbers
logs
christmas
standard deviation
pythagoras
light
map projections
coventry
wordle
fractals
cambridge
pi approximation day
crochet
golden spiral
dataset
probability
ternary
javascript
inline code
wave scattering
plastic ratio
simultaneous equations
determinants
wool
php
flexagons
databet
national lottery
manchester
friendly squares
tetris
golden ratio
turtles
crossnumber
stirling numbers
rust
coins
graphs
menace
latex
tmip
binary
oeis
craft
hannah fry
final fantasy
exponential growth
radio 4
hyperbolic surfaces
graph theory
statistics
pascal's triangle
sobolev spaces
mathsjam
edinburgh
hats
crosswords
cross stitch
bubble bobble
manchester science festival
go
people maths
palindromes
books
folding paper
advent calendar
gerry anderson
error bars
stickers
european cup
matt parker
squares
numerical analysis
thirteen
estimation
trigonometry
accuracy
quadrilaterals
approximation
correlation
london
countdown
news
newcastle
weather station
dinosaurs
football
big internet math-off
live stream
crossnumbers
kenilworth
finite element method
preconditioning
captain scarlet
data
weak imposition
kings
video games
reuleaux polygons
gather town
fonts
24 hour maths
geometry
tennis
machine learning
puzzles
arrangement puzzles
pokémon
ucl
errors
nonograms
game show probability
matrix of cofactors
braiding
propositional calculus
nine men's morris
world cup
hexapawn
royal institution
curvature
partridge puzzle
mathsteroids
data visualisation
finite group
computational complexity
boundary element methods
python
logic
dragon curves
sound
pi
platonic solids
guest posts
sport
pokémon wordle
london underground
misleading statistics
frobel
pac-man
polynomials
bluesky
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