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

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

Archive

Show me a random blog post
▼ show ▼

© Matthew Scroggs 2012–2026