mscroggs.co.uk

mscroggs.co.uk

blog puzzles academic talks contact subscribe ↓ ☰ ↓

Comment

Comments

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 Ã— (n-1) rectangle with 1 Ã— 2 dominoes and 2 Ã— 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

Archive

Show me a random blog post

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

Jan 2024

Christmas (2023) is over

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Tags

graph theory inverse matrices braiding speed sound hats the aperiodical tmip stirling numbers squares latex polynomials rust crossnumbers determinants newcastle pokémon triangles sorting thirteen error bars probability interpolation geogebra turtles graphs pi approximation day reuleaux polygons matrix of minors fonts programming gather town reddit fence posts mathslogicbot pizza cutting simultaneous equations quadrilaterals pythagoras bubble bobble machine learning php signorini conditions wave scattering gaussian elimination friendly squares alphabets mathsjam realhats frobel menace dates zines hyperbolic surfaces christmas chalkdust magazine trigonometry 24 hour maths golden ratio football talking maths in public arrangement puzzles data visualisation pokémon wordle logs binary matrices big internet math-off video games live stream warwick bodmas correlation mathsteroids tennis guest posts london manchester science festival edinburgh folding tube maps datasaurus dozen crochet dragon curves computational complexity exponential growth data bluesky rhombicuboctahedron books boundary element methods logic a gamut of games people maths convergence plastic ratio standard deviation manchester chess cross stitch accuracy european cup news game of life oeis geometry rugby royal baby propositional calculus sobolev spaces wordle gerry anderson dataset runge's phenomenon matrix multiplication weather station pascal's triangle martin gardner weak imposition kings light arithmetic asteroids final fantasy royal institution cambridge craft partridge puzzle radio 4 youtube mean hexapawn nine men's morris statistics harriss spiral palindromes hannah fry numbers national lottery bots ternary pac-man christmas card logo dinosaurs javascript finite group game show probability regular expressions world cup nonograms coins raspberry pi platonic solids phd coventry pi approximation ucl sport stickers wool captain scarlet inline code python estimation databet fractals golden spiral finite element method misleading statistics kenilworth advent calendar recursion matrix of cofactors go errors electromagnetic field crosswords crossnumber draughts tetris matt parker folding paper flexagons london underground map projections preconditioning countdown games noughts and crosses chebyshev curvature puzzles anscombe's quartet numerical analysis bempp

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026