Create an calendar table with only Year - Week numbers

CornelisV Try this:

Calendar Table = 
  VAR __BaseTable = CALENDAR( DATE( 2024, 1, 1), DATE( 2025, 12, 31 ) )
  VAR __Table = 
    ADDCOLUMNS(
      __BaseTable,
      "Year", YEAR( [Date] ),
      "WeekNumber", WEEKNUM( [Date] )
    )
  VAR __Result = DISTINCT( SELECTCOLUMNS( __Table, "Year", [Year], "Weeknumber", [WeekNumber] ) )
RETURN
  __Result