2=5-3(x2)    # 3..5, 5..7
4=11-7(x3)   # 7..11, 13..17, 19..23
6=29-23(x7)
8=97-89
14=127-113(x3)
18=541-523
20=907-887
22=1151-1129
34=1361-1327(x2)
36=9587-9551(x3)
44=15727-15683
52=19661-19609(x2)
72=31469-31397
86=156007-155921(x2)
96=360749-360653
112=370373-370261
114=492227-492113