Carnival of Mathematics 150

Episode 150 of the Carnival of Mathematics is now live, here on the CoDiMa blog.

Did you know that there are 150 groups of order 900? For what values of n is it true that the number of groups of order n divides n, and what are the possible quotients? (This is not a serious question.)

About Peter Cameron

I count all the things that need to be counted.
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