11th drive:
2223*2^755688-1 (227489 digits)

2583*2^693042-1 (208630 digits)
2463*2^693184-1 (208673 digits)

Got lucky on this one by starting at n=1.5M...

165*2^1521629-1 (458059 digits)

11th drive:
2081*2^697374-1 (209934 digits)
2069*2^697844-1 (210076 digits)

11th drive:
2239*2^757159-1 (227931 digits)

1015*2^1122611-1 (337943 digits)

11th drive:
2103*2^764046-1 (230005 digits)

11th drive:
2253*2^761112-1 (229121 digits)
2031*2^762115-1 (229423 digits)
2047*2^762513-1 (229543 digits)

11th drive:
2245*2^765825-1 (230540 digits)

2889*2^695567-1 (209390 digits)
2877*2^695940-1 (209503 digits)

1365*2^1125937-1 (338944 digits)