Problem The number 145 is well known for the property that the sum of the factorial of its digits is equal to 145: 1! + 4! + 5! = 1 + 24 + 120 = 145 Perhaps less well known is 169, in that it produces the longest chain of numbers that link back to [...]

The first of this series covered our general aims how we’d be structuring the project. This post will cover how we get the data into RavenDB. First we need to download the data. I got it obtained the data from this site, you need to click the “téléchange[...]

So Stack Overflow Dev Days has been cancelled. Obviously it’s a big disappointment to everyone involved, I thought the line up for the London event was great and I was looking forward to attending the conference as much as I was looking forward to speakin[...]

Problem Peter has nine four-sided (pyramidal) dice, each with faces numbered 1, 2, 3, 4. Colin has six six-sided (cubic) dice, each with faces numbered 1, 2, 3, 4, 5, 6. Peter and Colin roll their dice and compare totals: the highest total wins. The resul[...]

Problem By counting carefully it can be seen that a rectangular grid measuring 3 by 2 contains eighteen rectangles: Although there exists no rectangular grid that contains exactly two million rectangles, find the area of the grid with the nearest solution[...]

Problem In the 5 by 5 matrix below, the minimal path sum from the top left to the bottom right, by only moving to the right and down, is indicated in bold red and is equal to 2427. Find the minimal path sum, in matrix.txt (right click and ‘Save Link/Targe[...]

Problem Comparing two numbers written in index form like 211 and 37 is not difficult, as any calculator would confirm that 211 = 2048 < 37 = 2187. However, confirming that 632382518061 > 519432525806 would be much more difficult, as both numbers contain o[...]

After a few philosophical blog posts, I decided it was time for something a bit more concrete. I’ve been playing around a bit with F# and some web stuff recently using both RavenDB and PicoMvc so I thought I’d share with you how to create an autocomplete [...]

Interested in presenting at a conference on functional programming? Want to reach out to a potentially huge audience? Don’t mind the feeling of speaking alone to a webcam? Then Functional.net is for you! Please check it out and submit a talk. This is all [...]