Okay, interesting, though irrelevant to my conjecture, since I didn't claim that only multiples of 9 would be "demure", merely that the multiples of 9 all were (didn't actually get around to proving this yet, btw, so still just a conjecture, unless you've proven it or seen the proof).
I fail to see why it's all fluffy and special that 18 is the only one whose demure number is 2. Maybe that's because I'm just not that into number theory, relative to other areas of math (probably mostly because I haven't done much of it). But, basically, why do I care that 18 is the only number which is demure for 2 (perhaps this will be addressed by your later post)?
Fair enough. And I suppose that's not exactly what I'm getting at, anyway. Basically, is there a specific reason you find the specific demureness of 18 in this way more interesting than demureness in general, or some other reason why you started out by writing a post about 18's demureness instead of demureness in general, or did you just think of / stumble upon the 18 one, post about it, then think of / stumble upon the others, or what?
Yesterday I drove by 1818 Main Street, which I reflexively added together and got another 18, which made me happy. Then I noticed that it was the only four-digit number like that, and started thinking about the general property of numbers like that, and started calling the property of numbers that you can use to construct numbers like that "demureness", and started annoying Aaron in the global marketing strategy meeting this morning with it.
But I found 1818 interesting particularly because it was the first one.
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I fail to see why it's all fluffy and special that 18 is the only one whose demure number is 2. Maybe that's because I'm just not that into number theory, relative to other areas of math (probably mostly because I haven't done much of it). But, basically, why do I care that 18 is the only number which is demure for 2 (perhaps this will be addressed by your later post)?
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But I found 1818 interesting particularly because it was the first one.