Prize crossnumber, Issue 05

Our original prize crossnumber is featured on pages 58 and 59 of Issue 05.


  • Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
  • One randomly selected correct answer will win a £100 Maths Gear goody bag. Three randomly selected runners up will win a Chalkdust t-shirt. The prizes have been provided by Maths Gear, a website that sells nerdy things worldwide, with free UK shipping. Find out more at
  • To enter, submit the sum of the across clues via this form by 22 July 2017. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 30 July 2017.

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Dear Dirichlet, Issue 05

Dear Dirichlet

Moonlighting agony uncle Professor Dirichlet answers your personal problems. Want the prof’s help? Send your problems to

Dear Dirichlet,

I personally have a very deep, long-held belief in free-market capitalism and the value of hard work, but I was recently shocked to discover when I switched subjects that most people in my new research area are staunch followers of Karl Marx! I’ve had many arguments with my new colleagues on this. I can feel my energy slowly draining with every passing debate. How do I resolve this?

— Feeling blue, Surreyv

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What’s hot and what’s not, Issue 04

Maths is a fickle world. Stay à la mode with our guide to the latest trends.

Mathematical crochet

HOT Mathematical crochet

Hyperbolic surfaces! Klein bottles! Impress fellow passengers with your DIY manifolds!
[Picture: Flickr user Pandaeskimo, CC BY-NC 3.0]

NOT Paper Möbius strips

As Dirichlet says, Möbius strips should be band.

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Horoscope, Issue 03

Mar 21 – Apr 19

Today will be very odd for you, even though you are in your prime.
You share your sign with:
Sophie Germain
Apr 20 – May 20

A new mode of transport will give you a greater range. But do not be mean to those you love.
You share your sign with:
Carl Friedrich Gauss
May 21 – Jun 20

A decision will have a great bearing on your future happiness. It will test your quick reflexes.
You share your sign with:
Blaise Pascal

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