9915*2^829027-1 (249566 digits)

3289888875*2^801188-1 (241192 digits) (an old choose your own k...these guys are slow)

9579*2^833300-1 (250853 digits)

4101*2^882411-1 (265636 digits)
4189*2^883781-1 (266049 digits)
4127*2^884942-1 (266398 digits)

9309*2^840221-1 (252936 digits)

9639*2^842228-1 (253540 digits)

1305*2^1215064-1 (365774 digits)

11th drive:
2183*2^912938-1 (274826 digits)
2275*2^914425-1 (275273 digits)
2049*2^915180-1 (275500 digits)

4179*2^887088-1 (267044 digits)
4041*2^887910-1 (267292 digits)
4155*2^888872-1 (267581 digits)

9105*2^858810-1 (258532 digits)
9813*2^859555-1 (258756 digits)

9975*2^870297-1 (261990 digits)
9939*2^873540-1 (262966 digits)