DMFT probably needs wider margins. Hello! My name is Colin and I am a mathematician on a mission to spread the joy and delight in how everything fits together. Straight into the links this week! A mini-theme: going back in time My link collection has a lot of retro content this week, so let’s get…
Double Maths First Thing: Issue 13
DMFT is significantly less perplexing than HMRC Hello! My name is Colin and I am a mathematician on a mission to spread mathematical joy. This week, I’ve made another contribution to the OEIS (currently in review) about the excellent puzzle #23 from Scroggsvent that Matt has written up here. I’ve also written a blog post I’m unusually…
Aperiodical News Roundup – November & December 2024
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Here’s a round-up of some news stories from the last two months of 2024, (mostly) not otherwise covered here on the Aperiodical. Maths Research At the start of December, John Carlos Baez shared on Mathstodon that the moving sofa problem may have been solved – the question of the largest possible shape you can fit…
Double Maths First Thing, Issue 12
Double Maths First Thing is being written in the dark Hello! My name is Colin and I am a mathematician on a mission to spread mathematical joy and delight. However, at de moment, delights aren’t working; we’re in a power cut and I’m hoping my various batteries will hold out long enough to get DMFT…
Carnival of Maths 235
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The next issue of the Carnival of Mathematics, rounding up blog posts from the month of December 2024, is now online at John D Cook’s Blog. The Carnival rounds up maths blog posts from all over the internet, including some from our own Aperiodical. See our Carnival of Mathematics page for more information.
Double Maths First Thing: Issue 11
Double Maths First Thing is like a tall, dark stranger with some coal and some whisky Hello! My name is Colin and I am a mathematician on a mission to spread mathematical joy into 2025 and beyond. I note that 1/1/2025 is the first day since September 25th, 1936 where the day, month and year…
Numerical coincidences for 2025

There seem to be a lot of numerical coincidences bouncing around concerning the new year 2025. For example, it’s a square number: