- n=300-400k, 31k left (53, 495, 584, 586, 948, 1364, 1416, 1429, 1512, 1743, 1938, 2237, 2263, 2599, 2848, 3067, 3119, 3238, 3314, 3407, 3574, 3678, 3769, 3795, 3844, 4016, 4328, 4549, 4668, 4707, 4723)
- runtime 48min-1h42min (AVX@3.8Ghz)

2846*168^50670-1 found by taurec
4185*168^53498-1 found by Tejas
4471*168^54466-1 found by ardo
3309*168^63795-1 found by vaughan
1689*168^68676-1 found by Nick Name
4642*168^102567-1 found by JohnMD
2627*168^159255-1 found by Jaari
1626*168^168681-1 found by magic_sam
2852*168^118048-1 found by Dirk Broer
3106*168^127778-1 found by jon forbes
4382*168^132675-1 found by jon forbes
1754*168^135948-1 found by Helmuth M.
2852*168^157420-1 found by JohnMD
4614*168^151048-1 found by Science United
2852*168^181916-1 found by Science United
3797*168^301167-1 found by vaughan
1741*168^370406-1 found by Ralfy (TOP5000)