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So it takes 1299 then, if we include you.

1301, to be more precise.

Including you, and now me saying that it should be 1300, but with my answer it is in fact 1301 :D

No, GGP didn't count himself, GP pointed that out and also did count himself, so 1301 was correct, but now we're at 1303.

Point of clarification: is the father of the first user actually a GNU/Linux user?

Well he also uses the GNU/Lightbulb, so that's a yes