You're reading: cp’s mathem-o-blog

Everyone’s a mathematician

mathematician greatest mathematicians of all time

This morning Katie and I had a little discussion about house style on The Aperiodical. Mathematican Paul Taylor was listed as “Mathematician Paul Taylor” in the blurb for his featured post. I posited that everyone published here is a mathematician, so the “Mathematician” title is redundant.

This of course resulted in me writing a userscript which automatically prepends every name on the page with the honorific “Mathematician”.

Integer sequence review: A193430

The Online Encyclopedia of Integer Sequences contains over 200,000 sequences. It contains classics, curios, thousands of derivatives entered purely for completeness’s sake, short sequences whose completion would be a huge mathematical achievement, and some entries which are just downright silly.

For a lark, David and I have decided to review some of the Encyclopedia’s sequences. We’re rating sequences on four axes: NoveltyAestheticsExplicability and Completeness.

This is the triumphant return of the integer sequence reviews!

Primes p such that p+1 is in A055462.

23, 6911, 5944066965503999, ...

Babbage’s difference engine is really, really pretty

Hands up if you knew there was a working replica of Babbage’s difference engine in California.

(My hand is not up.)

This glorious machine lives in the Computer History Museum in Mountain View, California. A company called xRez Studio, which specialises in taking extremely high resolution gigapixel photos of things, has taken some extremely high resolution gigapixel photos of the difference engine. They’re so lovely that it feels wrong to be looking at them at work.