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.

2025-12-18

Is there a word missing (positive?) from Q9? Surely any positive integer, n, can be written as the sum of the consecutive integers -(n-1),...,-1,0,1,...,n-1,n.

Alec
on /blog/121

2025-12-18

@Alec: Yes, it should say positive integers

Matthew
on /blog/121

×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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026