The list is as follows:
(2^2- 1)*2^ 1
(2^3- 1)*2^2
(2^5- 1)*2^4
(2^7- 1)*2^6
(2^ 13- 1)*2^ 12
(2^ 17- 1)*2^ 16
(2^ 19- 1)*2^ 18
(2^3 1- 1)*2^30
(2^6 1- 1)*2^60
(2^89- 1)*2^88
(2^ 107- 1)*2^ 106
(2^ 127- 1)*2^ 126
(2^52 1- 1)*2^520
(2^607- 1)*2^606
(2^ 1279- 1)*2^ 1278
(2^2203- 1)*2^2202
(2^228 1- 1)*2^2280
(2^32 17- 1)*2^32 16
(2^4253- 1)*2^4252
(2^4423- 1)*2^4422
(2^9689- 1)*2^9688
(2^994 1- 1)*2^9940
(2^ 1 12 13- 1)*2^ 1 12 12
(2^ 19937- 1)*2^ 19936
(2^2 170 1- 1)*2^2 1700
(2^23209- 1)*2^23208
(2^44497- 1)*2^44496
(2^86243- 1)*2^86242
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^
(2^- 1)*2^