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Comments in green were written by me. Comments in blue were not written by me.
2020-01-02
It's interesting that the three puzzles with the most incorrect attempts can all be looked up on OEIS.
Day 15 -
https://oeis.org/A001055
- "number of ways of factoring n with all factors greater than 1"
Day 4 -
https://oeis.org/A001045
- "number of ways to tile a 2 × (n-1) rectangle with 1 × 2 dominoes and 2 × 2 squares"
Day 2 -
https://oeis.org/A002623
- "number of nondegenerate triangles that can be made from rods of length 1,2,3,4,...,n"
Adam Abrams
on
/blog/72
×1
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Interesting tautologies
Mar 2020
Log-scaled axes
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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
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Visualising MENACE's learning
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A non-converging LaTeX document
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Big Internet Math-Off stickers 2019
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Proving a conjecture
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realhats
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Christmas cross stitch
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Runge's Phenomenon
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World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
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A bad Puzzle for Today
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Building MENACEs for other games
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A 20,000-to-1 baby?
World Cup stickers 2018
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Origins of World War I
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The importance of estimation error
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Video game surfaces
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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
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Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
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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
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Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
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Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
chalkdust magazine
pascal's triangle
game show probability
boundary element methods
countdown
map projections
numerical analysis
people maths
weather station
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noughts and crosses
24 hour maths
palindromes
statistics
speed
cambridge
sorting
talking maths in public
london underground
video games
mean
squares
inverse matrices
electromagnetic field
gaussian elimination
turtles
platonic solids
sobolev spaces
braiding
chebyshev
london
golden spiral
logo
national lottery
stickers
reddit
curvature
bodmas
recursion
numbers
geogebra
ucl
advent calendar
errors
harriss spiral
bubble bobble
runge's phenomenon
estimation
logic
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christmas card
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exponential growth
football
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datasaurus dozen
sound
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big internet math-off
guest posts
games
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pythagoras
misleading statistics
phd
reuleaux polygons
radio 4
fence posts
cross stitch
world cup
puzzles
pi
stirling numbers
news
bempp
signorini conditions
live stream
menace
accuracy
hats
matrix of cofactors
mathsteroids
correlation
inline code
convergence
manchester science festival
pi approximation day
plastic ratio
matrix multiplication
the aperiodical
python
final fantasy
hexapawn
light
dragon curves
trigonometry
gather town
rugby
probability
graphs
a gamut of games
dataset
rhombicuboctahedron
geometry
anscombe's quartet
draughts
sport
wave scattering
error bars
crochet
chess
christmas
data
latex
fractals
weak imposition
dates
pizza cutting
finite element method
edinburgh
quadrilaterals
wool
matrix of minors
standard deviation
crossnumber
computational complexity
hannah fry
books
arithmetic
newcastle
manchester
flexagons
captain scarlet
approximation
go
data visualisation
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polynomials
simultaneous equations
golden ratio
pac-man
interpolation
dinosaurs
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game of life
realhats
finite group
tennis
fonts
preconditioning
folding tube maps
determinants
propositional calculus
royal institution
matt parker
binary
hyperbolic surfaces
frobel
coins
php
databet
nine men's morris
royal baby
matrices
craft
oeis
javascript
Archive
Show me a random blog post
▼ show ▼
▲ hide ▲
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 (g-e)-5 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
talking maths in public
games
speed
boundary element methods
game of life
turtles
manchester science festival
gerry anderson
hats
numerical analysis
crossnumber
menace
geogebra
books
24 hour maths
video games
golden ratio
harriss spiral
advent calendar
programming
news
mathslogicbot
national lottery
squares
craft
mathsjam
estimation
computational complexity
radio 4
world cup
inverse matrices
logs
standard deviation
correlation
python
rhombicuboctahedron
rugby
chess
folding paper
platonic solids
php
mean
dinosaurs
live stream
latex
interpolation
triangles
trigonometry
matrix of minors
fonts
light
sorting
runge's phenomenon
royal baby
plastic ratio
london underground
the aperiodical
big internet math-off
oeis
christmas
stickers
noughts and crosses
folding tube maps
databet
accuracy
probability
logic
braiding
draughts
manchester
tennis
hexapawn
sound
london
martin gardner
people maths
pizza cutting
polynomials
pascal's triangle
matrix multiplication
go
data visualisation
error bars
ternary
pythagoras
anscombe's quartet
final fantasy
errors
nine men's morris
royal institution
gaussian elimination
golden spiral
data
asteroids
countdown
matrix of cofactors
wool
newcastle
raspberry pi
exponential growth
geometry
binary
guest posts
european cup
sport
christmas card
puzzles
football
simultaneous equations
bodmas
machine learning
reddit
cross stitch
numbers
ucl
realhats
inline code
coins
phd
map projections
pi
preconditioning
electromagnetic field
matt parker
misleading statistics
graphs
weather station
cambridge
dates
tmip
palindromes
propositional calculus
fence posts
graph theory
bempp
flexagons
finite element method
crochet
javascript
datasaurus dozen
wave scattering
dataset
statistics
matrices
finite group
game show probability
fractals
pi approximation day
dragon curves
recursion
curvature
mathsteroids
reuleaux polygons
arithmetic
convergence
captain scarlet
pac-man
quadrilaterals
bubble bobble
approximation
stirling numbers
hyperbolic surfaces
logo
chalkdust magazine
frobel
gather town
edinburgh
a gamut of games
signorini conditions
zines
determinants
chebyshev
weak imposition
hannah fry
youtube
sobolev spaces
© Matthew Scroggs 2012–2024
Day 15 - https://oeis.org/A001055 - "number of ways of factoring n with all factors greater than 1"
Day 4 - https://oeis.org/A001045 - "number of ways to tile a 2 × (n-1) rectangle with 1 × 2 dominoes and 2 × 2 squares"
Day 2 - https://oeis.org/A002623 - "number of nondegenerate triangles that can be made from rods of length 1,2,3,4,...,n"
on /blog/72