ETA: edited thanks to vikingknight - so easy and I still had to work in silly mistakes - I'm just glad my boyfriend knows something about maths, too ;P
My only excuse should be understandable if you take a peek at the source text :D
* plus another way contributed by my personal Blitzgneisser can be found here

The numbers below are self-explaining. The German lines are in no way helpful.

Mathematische Folgen
Finden der rekursiven Formel (+ deren Beweis) unter Zuhilfenahme des Bildungsgesetzes:

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Dedicated to vikingknight, because as I browsed through his interests, I thought I was reading mine...

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Info x 3 (1 x history/HP, 1 x science & 1 x cultural)

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Info x 3 (2 x HP & 1 x Science)

1) Yesterday, I incidentally read the titles of the HP series and saw that the Philosopher's Stone is also available in Latin, Ancient Greek, Welsh and Irish. The Irish version is called "Harry Potter agus an Órchloch" and if you speak German, you will be laughing by now. "Órchloch" looks just like the Viennese pronunciation of "Asshole"

2) Someone (calling her friend would be an exaggeration) told my sister about a HP t-shirt (sounds familiar?) she saw recently. On the front it read "Dumbledore dies on page 556" and on the back "What? Be glad I didn't tell you that Snape killed him!"

3) Our sun system has ten planets! And I have yet to find time to gather information *gn*!