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.

2018-12-09

Loved these puzzles! I have no idea how to approach #9, though. Will the solutions be posted at any point? Or, can anyone provide a hint to how to approach it?

Seth
on /blog/59

2018-12-10

@Seth: try solving it for 3a+4b, 3a+5b, 4a+5b, etc and look for patterns

Matthew
on /blog/59

Archive

Show me a random blog post

2025

Jun 2025

A nonogram alphabet

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Tags

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2025