If you’ve worked with or used any sequences of integers lately (and let’s face it, you have) you might have looked them up in the OEIS. I’ve used it twice today, and it’s still before 9.30am. As you may have gathered from our extensive banging on about it, we’re huge fans of the Online Encyclopedia of Integer Sequences.
If you have visited their site recently, you might have noticed an extra paragraph of red text near the top – yes, they’re doing a Wikipedia, and asking for their users (which is realistically everyone) to donate so they can keep going. It’s a hugely worthy cause, and here at the Aperiodical, we think it’s worth supporting. The OEIS is owned and maintained by The OEIS Foundation Inc., a nonprofit company.
Head over to the OEIS for lists of integers with various properties, and to find out more.
We haven’t done one of these for absolutely ages. Since all three of us were at the big MathsJam conference a couple of weekends ago, we decided to introduce a local minimum into the fun curve by sitting down and talking about how this site’s doing.
Actually, we ended up talking about the MathsJam baking competition for absolutely ages.
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The next issue of the Carnival of Mathematics, rounding up blog posts from the month of October, and compiled by Shecky Riemann, is now online at Math-Frolic.
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.
Katie, one of our editors, has been contacted by Brendan with a question about some maths he’s been investigating. Read on to find out what he’s discovered, and read Katie’s response.
Dear The Aperiodical,
I’ve noticed an interesting property of numbers, and I wondered if you could tell me if this is something which is already known to mathematicians? I’ve been calling them Dual Inversal Numbers, but I’d love to know if they have an existing name, and if there’s anything else you can tell me about them.
Ada Lovelace Day was on 15th October this year. It’s an international celebration of the achievements of women in science, technology, engineering and maths, comprising blog posts about women scientists as well as live events around the world.
The nice people at FindingAda.com, the home of the Ada Lovelace Day project, have collated a set of essays on famous (and those perhaps unfairly overlooked) women in science, celebrating their contribution to many different areas, and telling their stories. The resulting book is called “A Passion for Science: Stories of Discovery and Invention”. Maths is certainly represented: as well as being part of a project named after a woman famously involved in mathematics, the book also contains (awkward plug ahead) a chapter on the mathematician Kathleen Ollerenshaw, written by the Aperiodical’s own Katie Steckles (me).
The book is available to buy as an eBook from the Finding Ada website for £5.99.
Buy the book: A Passion for Science: Stories of Discovery and Invention
About Ada Lovelace Day
Puzzlebomb is a monthly puzzle compendium. Issue 23 of Puzzlebomb, for November 2013, can be found here:
Puzzlebomb – Issue 23 – November 2013
The solutions to Issue 23 will be posted at the same time as Issue 24.
Previous issues of Puzzlebomb, and their solutions, can be found here.
Evelyn Lamb is a professional mathematician who has taken up journalism on the side. She received the AAAS Mass Media Fellowship last year, and spent the summer writing for the magazine Scientific American. We talked to her about maths journalism, the challenges involved in making advances accessible to a wider audience, and the differences between blogging and print journalism.
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