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

Question: For the Dec 15 puzzle, does a trivial solution in which the only odd factor is 1 count? Nothing in the text prohibits this currently, but want to make sure this was not just overlooked.

Dan Whitman
on /blog/120

2025-12-18

@Dan Whitman: yes, they count

Matthew
on /blog/120

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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026