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.)

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## About Peter Cameron

I count all the things that need to be counted.