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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026