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Dear Will Jagy,
Your question would probably be appropriate at one of:
http://math.stackexchange.com/
http://cstheory.stackexchange.com/
This site is for research-level questions, in mathematics itself, that are likely to have short well-defined answers. "Research-level" means, roughly, questions that might be discussed between two professors, or between graduate students working on Ph.D.'s, but not usually between a professor and the typical undergraduate student. It does not include questions at the level of difficulty of undergraduate homework.
Unfortunately, your message implies an incorrect claim that cstheory.stackexchange.com allows non-research-level questions. Please do not include cstheory.stackexchange.com in a list of the sites suggested for non-research-level questions. I do not know if this is related, but we are currently observing an undesired increase in the ratio of homework questions at cstheory.stackexchange.com. Please see a discussion on meta.cstheory.stackexchange.com for more information on this.
Thank you for your consideration. I cannot find any of these comments, but if I realize one, I will write here or add a comment on the same page as the comment.