What Is the Interval Number Seven?

The fundamental note or octave is one. Then comes whatever note et fifth gives us, and then the major third. Do we know what interval number seven represents? Or in other words, do we find any whole numbers half ing seven? What's half seven? Three and a half. So seven is a new soul. Seven half is three point five. If if 3 is the fifth, three point five is higher than that. Now, so it won't be a fourth. So what interval might it be? Sixth. Yes.