nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqc9m22hkc5h6zgrwkz48crhcpw6vch2rf6j97746ugl3neys86jeqcr59k6 (nprofile…59k6) it's a Fermat prime! a regular 17-gon is one of a few with odd number of vertices you can construct with a compass and a ruler. These who cancel 17 are doomed to reinvent these constructions from scratch. 🙂
https://en.m.wikipedia.org/wiki/Heptadecagon