The BSE benchmark Sensex was trading 74 points up at 17, 271 points a shortwhile ago. It recovered today by 105 points in early trade, on fresh buying by funds and retail investors at lower levels. The 30-share barometer had lost over 405 points on Thursday.In a similar fashion, the wide-based National Stock Exchange index Nifty was also trading 19 points up at 5,248 points.