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Think outside outside the box in our spring 2018 issue. No more tennis puns, primes mod 4, plus all your favourite regulars.

Infinitely many primes ending in 1, 3, 7 and 9 proved in typically Eulerian style.

Nira Chamberlain, one of the UK's top 100 scientists, shares his experiences as a black mathematician.

When you're caught in the rain without an umbrella... what is your best option?

Exploring the maths on offer at this year's UK hacker festival.

Are you a winner?