I am wondering where can I find information about compatibility on NAV 2013 R2 with Windows Server 2016 and SQL Server 2017?
The system requirements for NAV 2013 R2 on MSDN mentions only those version of OS and SQL which existed at the moment of NAV 2013 R2 release:
https://msdn.microsoft.com/en-us/library/dd301054(v=nav.71).aspx
Answers
I think it is just because when NAV 2013 R2 released, there is no windows erver 2016 and SQL Server 2017.
Like NAV 2009, it requires Windows Server 2008, but I still can use it in Windows Server 2012.