If my seats skip a number (e.g. seat 1 and seat 3), are they together?

Yes. In many of our concert venues (Nob Hill Masonic Center, Herbst Theatre, Palace of Fine Arts, Calvin Simmons Theatre, Davies Symphony Hall, War Memorial Opera House), the seating is arranged with single or double-digit even numbered seats on one side of the hall and odd numbered seats on the other. So if your string of seats is consecutive even or odd numbers, all your seats are still together.