mirrorbird (17:27:40) which is half a square shape -- and a square is x*x -- so something like that
Rapture (17:27:38) big brown bats and russian blue cats = AWESOME DUDES.
mirrorbird (17:27:31) it is a triangular number because if you write 1 dot, then 2 dots, then 3 dots ... you make a triangle shape
Rapture (17:27:24) SUPER GEIL!
Rapture (17:27:20) repeat after me!
Rapture (17:27:17) fledermäuse sind geil!
Rapture (17:27:01) or are there math professors who know what they're doing there.
mirrorbird (17:26:53) don't let this man on the plane, he has Fledermaustollwut!
Rapture (17:26:52) but why n(n+1)/2 .. did someone got it by accident?
Rapture (17:26:35) haha mirror
Time Left: 2:49
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