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2020-12-24
I couldn't get 19, so I brute forced Santa's location using what I already knew and then used that to brute force 19. Ha! (it turns out I was off on 19 by 34 - I still don't know where I went wrong)
This year's calendar was great. Thanks :)
Scott
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Archive
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2026
May 2026
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A new puzzle every day
Mixing Wordle with other games
Feb 2026
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2025
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Christmas card 2025
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The partridge puzzle
Aug 2025
TMiP 2025 puzzle hunt
Jun 2025
A nonogram alphabet
Mar 2025
How to write a crossnumber
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Christmas (2024) is over
Friendly squares
2024
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A regular expression Christmas puzzle
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Sep 2023
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Chalkdust issue 17
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Logo Asteroids
Mar 2023
Mathsteroids on hyperbolic surfaces
Feb 2023
The databet
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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
2021
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Dec 2021
Christmas card 2021
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Sep 2021
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May 2021
Close encounters of the second kind
Jan 2021
Christmas (2020) is over
2020
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Dec 2020
Christmas card 2020
Nov 2020
Christmas (2020) is coming!
Jul 2020
Happy -5+5φ+√2 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
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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
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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
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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
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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
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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
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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
friendly squares
edinburgh
youtube
ternary
arithmetic
determinants
pythagoras
matrix of minors
reddit
weak imposition
reuleaux polygons
plastic ratio
rhombicuboctahedron
crochet
recursion
bots
interpolation
european cup
preconditioning
squares
curvature
inline code
hexapawn
probability
harriss spiral
propositional calculus
crossnumbers
pi approximation day
fractals
thirteen
countdown
pizza cutting
go
frobel
cross stitch
london underground
london
crosswords
talking maths in public
realhats
programming
news
anscombe's quartet
platonic solids
simultaneous equations
finite element method
accuracy
warwick
geometry
tetris
stirling numbers
dates
ucl
folding paper
graph theory
boundary element methods
gather town
wave scattering
sound
newcastle
hats
live stream
php
binary
exponential growth
phd
dataset
matrix of cofactors
error bars
python
christmas
pokémon
the aperiodical
radio 4
sobolev spaces
mathslogicbot
convergence
folding tube maps
coventry
cambridge
databet
video games
trigonometry
puzzles
partridge puzzle
mathsjam
fonts
mathsteroids
turtles
bubble bobble
books
rust
gaussian elimination
hyperbolic surfaces
kenilworth
braiding
oeis
a gamut of games
24 hour maths
mean
coins
final fantasy
arrangement puzzles
world cup
zines
chess
matt parker
game of life
numerical analysis
pi
statistics
triangles
tmip
standard deviation
manchester science festival
national lottery
noughts and crosses
pac-man
manchester
craft
bluesky
royal institution
alphabets
games
chebyshev
hannah fry
inverse matrices
regular expressions
bodmas
game show probability
dragon curves
signorini conditions
data
martin gardner
pokémon wordle
runge's phenomenon
datasaurus dozen
data visualisation
approximation
crossnumber
javascript
estimation
polynomials
sorting
fence posts
quadrilaterals
advent calendar
dinosaurs
palindromes
geogebra
menace
guest posts
speed
finite group
matrices
golden spiral
raspberry pi
nine men's morris
graphs
gerry anderson
misleading statistics
rugby
electromagnetic field
christmas card
weather station
stickers
kings
nonograms
royal baby
logo
asteroids
people maths
errors
captain scarlet
logs
logic
latex
big internet math-off
sport
matrix multiplication
football
wordle
machine learning
pascal's triangle
numbers
draughts
map projections
bempp
flexagons
light
correlation
wool
chalkdust magazine
computational complexity
tennis
golden ratio
Archive
Show me a random blog post
▼ show ▼
▲ hide ▲
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
Zines, pt. 2
Jan 2024
Christmas (2023) is over
2023
▼ show ▼
▲ hide ▲
Dec 2023
Christmas card 2023
Nov 2023
Christmas (2023) is coming!
Zines
Sep 2023
TMiP 2023 puzzle hunt
May 2023
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 -5+5φ+√2 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
binary
standard deviation
accuracy
talking maths in public
geometry
advent calendar
christmas card
finite group
puzzles
world cup
sobolev spaces
tmip
phd
golden ratio
wool
boundary element methods
books
fonts
pokémon
bodmas
golden spiral
rugby
misleading statistics
latex
countdown
football
gather town
crochet
thirteen
datasaurus dozen
tetris
reuleaux polygons
pythagoras
hannah fry
computational complexity
signorini conditions
people maths
games
pi
convergence
harriss spiral
national lottery
the aperiodical
machine learning
data
databet
game show probability
craft
news
programming
sorting
london underground
bots
recursion
chalkdust magazine
light
christmas
video games
sound
curvature
nine men's morris
graph theory
inline code
game of life
flexagons
fractals
chebyshev
manchester science festival
bempp
wordle
trigonometry
hyperbolic surfaces
probability
pac-man
crossnumber
rhombicuboctahedron
anscombe's quartet
determinants
graphs
alphabets
pi approximation day
triangles
kings
mean
matrices
asteroids
weather station
preconditioning
pascal's triangle
sport
dates
folding paper
reddit
dataset
ternary
exponential growth
php
coventry
youtube
oeis
electromagnetic field
quadrilaterals
braiding
plastic ratio
matrix multiplication
runge's phenomenon
pizza cutting
tennis
captain scarlet
frobel
python
error bars
matt parker
approximation
royal baby
matrix of cofactors
propositional calculus
dinosaurs
coins
matrix of minors
european cup
map projections
errors
crossnumbers
draughts
finite element method
go
data visualisation
raspberry pi
estimation
zines
fence posts
regular expressions
royal institution
crosswords
kenilworth
simultaneous equations
gerry anderson
chess
stirling numbers
big internet math-off
rust
weak imposition
cambridge
bluesky
correlation
mathslogicbot
geogebra
manchester
london
dragon curves
turtles
logo
polynomials
guest posts
gaussian elimination
live stream
warwick
ucl
noughts and crosses
arithmetic
pokémon wordle
friendly squares
inverse matrices
menace
numerical analysis
realhats
interpolation
24 hour maths
cross stitch
bubble bobble
platonic solids
a gamut of games
folding tube maps
wave scattering
newcastle
partridge puzzle
squares
mathsteroids
hats
arrangement puzzles
stickers
martin gardner
javascript
speed
mathsjam
logs
hexapawn
palindromes
final fantasy
radio 4
edinburgh
numbers
logic
nonograms
statistics
© Matthew Scroggs 2012–2026
This year's calendar was great. Thanks :)
on /blog/86