Of all the known tannaim, how many of them were considered first generation tannaim? This link gives a list of a few first generation tannaim, but I'm sure there should be more in the list, such as Admon ben Gaddai and Hanan ben Avishalom.
But first, how do we define the period of the first generation? Would it be after the deaths of Hillel and Shammai until 80 C.E., or would the period of the first generation be defined differently?
Once we've defined the above, what are the list of names of those who lived during the first generation of Tannaim?