The new header logo broke the tabs.

[edit] Oh, actually, no.. tabs have now been fixed by kaeladan.

(Thanks!)

This counting puzzle from Matt Parker looks like the kind you should write a program to solve:

Imagine f(n) that counts the occurrences of the digit “1″ in {1,2,3…n}.

Eg f(13)=6

For what values of n does f(n)=n?

That’s all well and good – until you find yourself in a car park, waiting twenty minutes for a taxi. Under these circumstances, it’s reasonable to consider the first few values of f(n)…

Well, f(n)=1 for n=1,2,3,…9. Then you get a lot of changes in a row – f(10)=2, f(11)=4 and so on up to f(19)=12. And, since the next changes are far apart – 21,31,41… – that’s the closest f(n) and n will be for some time.

It’s been ages since the last post. So, here’s a puzzle. And, if you want to compare solutions, look here.

There’s a new version of Zupple in the App Store with an updated movie list and a new icon. The Zupple product page is here. Man, that’s terse.

This video shows the history of Zupple – from prototype to finished game – in about a minute.

Here’s a link to the video on youtube.

Or, is it ‘in’ the App Store? I appear to be inconsistent on that point.

Either way, here’s a link to Zupple in/on the App Store.

Click here to see the various stages of Zupple as it went from initial prototype through to finished game.

Zupple was submitted to the App Store today. There’s a new page here which has a little more info, and will hopefully have even more in time for the release.

Update: Sorry, the Doodloid free giveaway is now over.

Click this link to comment on the video.

Following requests in the YouTube comments, there’s now video showing Doodloid running.

And, there’s also a new improved version of the Doodloid promo’ video.