Huna, the son of Rami bar Zutra, during the time of Rav Ashi [and this is what they said to Ravina in Bava Batra (Perek 6, Mishnah 1) regarding genealogies, that they doubled and calculated for two, and there was a transcription error]:
Seder_HaDorot,_Tanaim_and_Amoraim.980:1