An Australian sanitary pad company has hit upon a witty tagline for their product:

Literally thousands of people have signed a petition to tell Libra that that’s not OK.

An Australian sanitary pad company has hit upon a witty tagline for their product:

Literally thousands of people have signed a petition to tell Libra that that’s not OK.

*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: Novelty, Aesthetics, Explicability and Completeness.*

**CP: **It’s Neil Sloane’s 75th birthday today! As a special birthday gift to him, we’re going to review some integer sequences.

**DC: **His birthday is 10/10, that’s pretty cool.

**CP: ***<some quick oeis> *there’s a sequence with his birthdate in it! A214742 contains 10,10,39.

**DC: **We can’t review that. It’s terrible.

**CP:** I put it to you that you have just reviewed it.

**DC: **Shut up.

**CP:** Anyway, I’ve got some birthday sequences to look at.

**DC: **About cake?

**CP: **No.

A050255

Diaconis-Mosteller approximation to the Birthday problem function.1, 23, 88, 187, 313, 459, 622, 797, 983, 1179, 1382, 1592, 1809, 2031, 2257, 2489, 2724, 2963, 3205, 3450, 3698, 3949, 4203, 4459, 4717, 4977, 5239, 5503, 5768, 6036, 6305, 6575, 6847, 7121, 7395, 7671, 7948, 8227, 8506, 8787, 9068, 9351

John Edmark has 3d-printed a series of sculptures which do something rather remarkable when you rotate them. In the stop-motion animation above, the sculpture rotates by the golden angle in each frame.

**See more:** Blooming Zoetrope Sculptures by John Edmark at Instructables.

*via Henry Segerman on Google+*

A while ago I collected a few of the mathsy games I play on my phone to while away my commute. I’ve found a few new ones since then, so I thought I’d do a new post to tell you about them.

Khan Academy has released a new library to typeset mathematical notation on webpages, called KaTeX.

Recently Tim Hutton and Adam Goucher have been playing around with hyperbolic tesselations. That has produced a {4,3,5} honeycomb grid for the reaction-diffusion simulator *Ready*, which Adam talked about on his blog a couple of days ago. Tim has also made a much simpler toy to play with in your browser: a visualisation of mirror tilings (the Wythoff construction) in spaces with different curvatures.

*Hyperplay* lets you select the kind of regular polygon you want to tile, and then your mouse controls the curvature of the space it sits in. Certain curvatures produce exact tilings of the space – for example, triangles tile a space with zero curvature – and you get projections of polyhedra for certain positive curvatures.

For a while, the Science Museum has been forming groups and making noises and tickling rich people with the aim of working out how they’re going to update their rather neglected maths hall. Yesterday they made an unexpectedly positive announcement: they’ve been given £5 million by rich people David and Claudia Harding, and Dame Zaha Hadid has drawn up a swooshy new design.