@catspawspec Hi Loren! That's a valid question indeed. Basically '2017week1' is for this week only. It is for our Weekly Theme contest. This week, the theme is specifically related to 365 projects. At the end of the week, our panel of judges will select their top 3 favorites. You don't need a '#' symbol.
The #photoblog365 includes a '#' symbol because it is intended to be a cross-platform hashtag to be used here on PhotoBlog, Instagram, Twitter, Facebook, etc. I hope this makes sense. Sorry for any confusion!