Log in
Subscribe
Menu
US Election 2024
Politics
World
Ideas
Views
Culture
Latest issue
Podcasts
Newsletters
Log in
Subscribe
Hide this label
Latest issue
Newsletters
Podcasts
Sections
Politics
Election 2024
England
Scotland
Northern Ireland
Wales
Constitution
Brexit
Analysis
Policy
World
Environment
United States
China
Europe
Middle East
The Americas
Asia
Africa
Ideas
Top Thinker
Philosophy
Law
Technology
Media
Religion
Economics
Business
Identity
Views
Columnists
People
Lives
Letters
Brief Encounter
Culture
Books
Film
TV
Stage
Music
Art
Gaming
More from Prospect
App
Policy Insight reports
Events
Past issues
Commercial opportunities
Regulars
From the November 2015 issue
Enigmas and puzzles by Barry R Clarke: issue 236
Intellect stretching mathematical problems
By
Prospect Team
October 14, 2015
Prospect Editorial Team
Please enable JavaScript to view the
comments powered by Disqus.
Popular in Regulars
Letters: April 2023 edition
The Prospect Grid: April 2023
The Prospect Grid: March 2023
Related articles
Stephen Collins: The Photoshop coronation
Steve Bell’s Christmas carol
Stephen Collins: The rest is extinction
Listen to our podcast
Q&A US election special, with Jill Abramson
US election 2024: The final days
Witches, conspiracies and the US election
