Proof of some conjectured formulas for 1/pi by Z.-W. Sun
  Recently Z.W.Sun found over hundred conjectured formulas for 1/pi. Many of them were proved by H.H.Chan, J.Wan andW.Zudilin (see [3], [8] in the paper). Here we show that several other formulas in [6] are simple transformations of known formulas for 1/pi. 
Gert Almkvist, Alexander Aycock, appendix by Arne Meurman
math.NT