The Bombay Stock Exchange benchmark Sensex on Monday gained over 104 points to quote at 17224 in the afternoon trade. The wide-based National Stock Exchange index Nifty also moved up 22 points to 5,139.Brokers said recovery in some of the Asian stock market after a poor start helped the trading sentiment in the domestic bourses.The Hong Kong's Hang Seng Index was up 0.09 per cent after declining by 1.20 per cent in volatile trade on Monday.