- n=100-300k, 16k left (970, 1750, 2770, 3132, 5266, 11182, 17640, 24036, 24300, 25110, 36772, 37348, 39288, 42856, 43776, 44706)
- runtime 8min39s-1h29min (AVX@3.8Ghz)

21100*421^25176+1 found by [SG-FC] hl
378*421^31064+1 found by rebirther
10402*421^31995+1 found by LCB001
19150*421^32052+1 found by vaughan
48552*421^34241+1 found by Extra Ball
31018*421^35480+1 found by [SG-FC] hl
32382*421^37991+1 found by Johnny Rotten
25768*421^38868+1 found by Johnny Rotten
25530*421^39551+1 found by ardo
50430*421^42916+1 found by [SG-FC] hl
49782*421^44740+1 found by [SG-FC] hl
36520*421^67040+1 found by Johnny Rotten
3186*421^91460+1 found by Ralfy
3472*421^114140+1 found by whizbang
26850*421^164666+1 found by whizbang
9726*421^166757+1 found by whizbang
9216*421^191802+1 found by whizbang (TOP5000)
14296*421^216090+1 found by KySU (TOP5000)
24838*421^224768+1 found by KySU (TOP5000)
26362*421^244658+1 found by JohnMD (TOP5000)
26040*421^251428+1 found by KySU (TOP5000)