- n=25-100k, 36k left (186, 376, 382, 2378, 2752, 2976, 4280, 5440, 6152, 8436, 9698, 10310, 10676, 10760, 11008, 11322, 11496, 12102, 12262, 12672, 12916, 12946, 13108, 13996, 14208, 14312, 14358, 15938, 16220, 17056, 17140, 17486, 17748, 19190, 19478, 19520)
- runtime 43s-12min (AVX@3.8Ghz)

9070*621^26640+1 found by zombie67 [MM]
16476*621^26910+1 found by zlodeck
14572*621^27562+1 found by Johnny Rotten
5792*621^27588+1 found by Timothy Dickey
15102*621^29028+1 found by zombie67 [MM]
18970*621^31807+1 found by Johnny Rotten
18376*621^32005+1 found by Mumps [MM]
16286*621^33402+1 found by shiva
612*621^38089+1 found by zombie67 [MM]
1132*621^38173+1 found by zombie67 [MM]
14658*621^40736+1 found by Johnny Rotten
5286*621^46703+1 found by scole of TSBT
18170*621^47578+1 found by Ralfy
1392*621^49966+1 found by Ralfy
970*621^54232+1 found by ardo
11508*621^56084+1 found by phaeton57
4010*621^64906+1 found by ardo
6442*621^72626+1 found by Johnny Rotten
14066*621^86829+1 found by Ralfy
9482*621^93215+1 found by Ralfy
11380*621^93327+1 found by Cruncher Pete
11602*621^93867+1 found by Ralfy
12168*621^95200+1 found by Ralfy