- n=100-300k, 12k left (418, 816, 924, 1418, 1524, 1644, 2256, 3598, 4000, 4084, 4170, 4368)
- runtime 14min42s-2h10min (AVX@3.8GHz)

3826*687^28574-1 found by Ralfy
590*687^32515-1 found by [AF>Le_Pommier] Aillas
2292*687^35174-1 found by Ralfy
4396*687^36045-1 found by Ralfy
644*687^45148-1 found by Peciak
1504*687^64896-1 found by [AF>Amis des Lapins] Nabz37
3012*687^67569-1 found by Adrian Schori
3756*687^72985-1 found by Sabroe_SMC
2008*687^75320-1 found by ThrasherX-17
656*687^89119-1 found by Odicin
4356*687^142063-1 found by emoga
4356*687^146773-1 found by DeleteNull
1958*687^198762-1 found by Doug (TOP5000)
4508*687^204090-1 found by TBeck_All (TOP5000)
2154*687^263317-1 found by Spritex (TOP5000)
2154*687^274573-1 found by Rantanplan (TOP5000)
676*687^282491-1 found by Gibson Praise (TOP5000)