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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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Happy (τπ)-14 Approximation Day!
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A surprising fact about quadrilaterals
Interesting tautologies
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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
Matrix multiplication
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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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Harriss and other spirals
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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
May 2018
A bad Puzzle for Today
Apr 2018
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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Tube map kaleidocycles
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Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
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Euro 2016 stickers
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Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
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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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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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▲ hide ▲
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
noughts and crosses
accuracy
mathsteroids
datasaurus dozen
pi
determinants
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machine learning
latex
advent calendar
london underground
cross stitch
finite element method
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christmas
dragon curves
logs
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braiding
graphs
numbers
exponential growth
raspberry pi
mathslogicbot
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go
interpolation
flexagons
tmip
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talking maths in public
games
databet
video games
quadrilaterals
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nine men's morris
hannah fry
squares
zines
the aperiodical
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weather station
computational complexity
hexapawn
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runge's phenomenon
standard deviation
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pythagoras
folding tube maps
stickers
european cup
sound
errors
gerry anderson
folding paper
preconditioning
rugby
logo
trigonometry
triangles
numerical analysis
inverse matrices
wave scattering
hats
game show probability
big internet math-off
anscombe's quartet
london
python
draughts
data
manchester science festival
palindromes
geogebra
pascal's triangle
programming
misleading statistics
phd
data visualisation
error bars
live stream
sport
sobolev spaces
final fantasy
realhats
finite group
logic
dates
php
rhombicuboctahedron
asteroids
probability
coins
matrix of cofactors
chalkdust magazine
craft
inline code
chebyshev
correlation
radio 4
people maths
fractals
bubble bobble
royal institution
bodmas
estimation
signorini conditions
weak imposition
guest posts
pac-man
crochet
news
a gamut of games
golden spiral
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stirling numbers
crossnumber
countdown
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propositional calculus
mean
24 hour maths
captain scarlet
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matrix of minors
royal baby
ucl
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pi approximation day
cambridge
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golden ratio
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approximation
pizza cutting
fonts
books
mathsjam
world cup
javascript
harriss spiral
graph theory
geometry
boundary element methods
christmas card
chess
dinosaurs
frobel
oeis
reddit
fence posts
light
matt parker
Archive
Show me a random blog post
▼ show ▼
▲ hide ▲
2024
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 (τπ)-14 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
hexapawn
big internet math-off
mathslogicbot
geogebra
chess
convergence
pi approximation day
javascript
books
pac-man
weak imposition
sport
the aperiodical
martin gardner
map projections
ucl
captain scarlet
hannah fry
video games
determinants
mathsteroids
binary
mathsjam
computational complexity
ternary
european cup
draughts
game show probability
inline code
game of life
data
cross stitch
live stream
estimation
flexagons
probability
turtles
rhombicuboctahedron
asteroids
final fantasy
football
graph theory
matrix of cofactors
sorting
mean
curvature
latex
sobolev spaces
wool
boundary element methods
palindromes
dates
pythagoras
speed
advent calendar
fence posts
dinosaurs
matrix of minors
error bars
people maths
python
guest posts
logic
manchester
polynomials
inverse matrices
golden spiral
menace
matrix multiplication
fonts
machine learning
pizza cutting
statistics
christmas
frobel
propositional calculus
folding tube maps
talking maths in public
graphs
chalkdust magazine
recursion
braiding
accuracy
harriss spiral
world cup
countdown
light
london underground
zines
finite element method
reddit
edinburgh
rugby
hyperbolic surfaces
crossnumber
coins
24 hour maths
quadrilaterals
exponential growth
puzzles
errors
preconditioning
misleading statistics
nine men's morris
geometry
dataset
crochet
folding paper
plastic ratio
php
anscombe's quartet
runge's phenomenon
electromagnetic field
finite group
go
data visualisation
tmip
pascal's triangle
news
radio 4
gather town
realhats
correlation
pi
bempp
databet
cambridge
newcastle
sound
bodmas
stirling numbers
matt parker
a gamut of games
games
matrices
royal baby
wave scattering
logo
national lottery
youtube
platonic solids
gaussian elimination
manchester science festival
numerical analysis
trigonometry
weather station
signorini conditions
bubble bobble
interpolation
craft
dragon curves
logs
simultaneous equations
royal institution
gerry anderson
phd
tennis
stickers
hats
christmas card
noughts and crosses
datasaurus dozen
squares
golden ratio
approximation
fractals
programming
numbers
arithmetic
standard deviation
london
chebyshev
raspberry pi
triangles
reuleaux polygons
oeis
© 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