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.

2018-12-10

Great puzzle problems! Hint on #9: try starting with an analogous problem using smaller numbers (e.g. 3a + 10b). This helped me to see what I had to do more generally.

Noah
on /blog/59

×1

Archive

Show me a random blog post

2025

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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2025