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@Oliver Schick
I'm not sure. If he did, I can't remember. He just used it constantly in examples. I do remember that another maths teacher of mine had 60 as his favourite number, and that was because it had lots of divisors for such a small number and other aspects of what you could do with it mathematically.
Interestingly, he wasn't such a great mathematician (so said all the good mathematicians, I wouldn't have known) but an excellent teacher, whereas the number 17 guy was a very good mathematician (so said all the ...) and a not-quite-so-excellent teacher. I'd assume that his reasons for liking 17 would have been less arithmetical than the other guy's, who loved mental arithmetic, which is apparently frowned upon by real mathematicians.