- n=100-300k, 20k left (1080, 1518, 2258, 2382, 2804, 2900, 4124, 4680, 6540, 7224, 7442, 7842, 8388, 9038, 9578, 9584, 9608, 9704, 10260, 10362)
- runtime 14min-2h20min

6372*991^34388-1 found by zombie67
10050*991^38711-1 found by Ralfy
9074*991^40763-1 found by vaughan
8804*991^45118-1 found by Kalomel
5240*991^48787-1 found by [AF>Libristes] ElGuillermo
5294*991^50019-1 found by mimeq
7218*991^50722-1 found by DoctorNow
32*991^52191-1 found by Ralfy
3942*991^71722-1 found by Peciak
9270*991^117155-1 found by zlodeck
11040*991^143110-1 found by Science United
5118*991^149498-1 found by Science United
11040*991^191080-1 found by G
1964*991^297652-1 is found by Science United (TOP5000)