22!20-1 trivially factors prime!: 43 (digits:2)
 28!20-1 trivially factors prime!: 223 (digits:3)
 32!20-1 trivially factors prime!: 383 (digits:3)
 38!20-1 trivially factors prime!: 683 (digits:3)
 42!20-1 trivially factors prime!: 1847 (digits:4)
 54!20-1 trivially factors prime!: 25703 (digits:5)
 58!20-1 trivially factors prime!: 39671 (digits:5)
 70!20-1 trivially factors prime!: 1049999 (digits:7)
 80!20-1 trivially factors prime!: 3839999 (digits:7)
 84!20-1 trivially factors prime!: 22708223 (digits:8)

 Primality testing 118!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 48.57%
 118!20-1 is prime! (0.020000 seconds) (digits:11)

 Primality testing 132!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 50.00%
 132!20-1 is prime! (0.010000 seconds) (digits:13)

 Primality testing 140!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 42.86%
 140!20-1 is prime! (0.000000 seconds) (digits:13)

 Primality testing 172!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 45.45%
 172!20-1 is prime! (0.010000 seconds) (digits:17)

 Primality testing 178!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 37.50%
 178!20-1 is prime! (0.040000 seconds) (digits:18)

 Primality testing 190!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 43.55%
 190!20-1 is prime! (0.010000 seconds) (digits:19)

 Primality testing 202!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 40.91%
 202!20-1 is prime! (0.050000 seconds) (digits:20)

 Primality testing 204!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 46.27%
 204!20-1 is prime! (0.010000 seconds) (digits:21)

 Primality testing 218!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 37.50%
 218!20-1 is prime! (0.030000 seconds) (digits:22)

 Primality testing 252!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 44.19%
 252!20-1 is prime! (0.020000 seconds) (digits:27)

 Primality testing 332!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 41.18%
 332!20-1 is prime! (0.020000 seconds) (digits:37)

 Primality testing 360!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 40.00%
 360!20-1 is prime! (0.020000 seconds) (digits:40)

 Primality testing 404!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 42.00%
 404!20-1 is prime! (0.020000 seconds) (digits:46)

 Primality testing 482!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 37.50%
 482!20-1 is prime! (0.020000 seconds) (digits:56)

 Primality testing 592!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.32%
 592!20-1 is prime! (0.020000 seconds) (digits:71)

 Primality testing 738!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 36.75%
 738!20-1 is prime! (0.251000 seconds) (digits:92)

 Primality testing 832!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 36.78%
 832!20-1 is prime! (0.030000 seconds) (digits:105)

 Primality testing 850!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.01%
 850!20-1 is prime! (0.040000 seconds) (digits:108)

 Primality testing 898!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 34.21%
 898!20-1 is prime! (0.050000 seconds) (digits:115)

 Primality testing 1052!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 34.57%
 1052!20-1 is prime! (0.040000 seconds) (digits:138)

 Primality testing 1082!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.47%
 1082!20-1 is prime! (0.230000 seconds) (digits:143)

 Primality testing 1174!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.84%
 1174!20-1 is prime! (0.380000 seconds) (digits:157)

 Primality testing 1830!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 41.50%
 1830!20-1 is prime! (0.190000 seconds) (digits:261)

 Primality testing 1844!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 40.09%
 1844!20-1 is prime! (0.141000 seconds) (digits:263)

 Primality testing 2088!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.76%
 2088!20-1 is prime! (0.170000 seconds) (digits:304)

 Primality testing 2092!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.38%
 2092!20-1 is prime! (0.871000 seconds) (digits:304)

 Primality testing 2150!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 40.48%
 2150!20-1 is prime! (0.250000 seconds) (digits:314)

 Primality testing 2490!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.56%
 2490!20-1 is prime! (0.361000 seconds) (digits:371)

 Primality testing 2804!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 37.76%
 2804!20-1 is prime! (1.142000 seconds) (digits:425)

 Primality testing 3078!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 34.16%
 3078!20-1 is prime! (1.822000 seconds) (digits:472)

 Primality testing 4020!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 55.59%
 4020!20-1 is prime! (1.052000 seconds) (digits:639)

 Primality testing 5180!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 53.80%
 5180!20-1 is prime! (1.692000 seconds) (digits:852)

 Primality testing 6162!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.87%
 6162!20-1 is prime! (11.697000 seconds) (digits:1036)

 Primality testing 6898!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.46%
 6898!20-1 is prime! (11.967000 seconds) (digits:1176)

 Primality testing 8070!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.81%
 8070!20-1 is prime! (6.289000 seconds) (digits:1404)

 Primality testing 8974!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.82%
 8974!20-1 is prime! (5.218000 seconds) (digits:1581)

 Primality testing 9230!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.98%
 9230!20-1 is prime! (7.140000 seconds) (digits:1632)

 Primality testing 15078!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.94%
 15078!20-1 is prime! (7.594000 seconds) (digits:2825)

 Primality testing 16644!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.93%
 16644!20-1 is prime! (49.656000 seconds) (digits:3154)

 Primality testing 20568!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.76%
 20568!20-1 is prime! (13.172000 seconds) (digits:3992)

 Primality testing 20978!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.77%
 20978!20-1 is prime! (14.828000 seconds) (digits:4080)

 Primality testing 23230!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.91%
 23230!20-1 is prime! (52.031000 seconds) (digits:4570)

 Primality testing 24450!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.75%
 24450!20-1 is prime! (86.218000 seconds) (digits:4837)

 Primality testing 34918!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.63%
 34918!20-1 is prime! (223.110000 seconds) (digits:7176)

 Primality testing 38924!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.36%
 38924!20-1 is prime! (78.132000 seconds) (digits:8091)

 Primality testing 39214!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.92%
 39214!20-1 is prime! (333.470000 seconds) (digits:8158)

 Primality testing 52658!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.63%
 52658!20-1 is prime! (667.891000 seconds) (digits:11290) Ian Brown 05/2003

 Primality testing 73052!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.39%
 73052!20-1 is prime! (627.533000 seconds) (digits:16182) Ian Brown 05/2003

 Primality testing 77900!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 39.83%
 77900!20-1 is prime! (668.866000 seconds) (digits:17364) Ian Brown 05/2003

 Primality testing 104448!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.95%
 104448!20-1 is prime! (2703.337000 seconds) (digits:23946) Ian Brown 05/2003

 Primality testing 107052!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.86%
 107052!20-1 is prime! (1355.249000 seconds) (digits:24600) Ian Brown 05/2003

 Primality testing 113842!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.46%
 113842!20-1 is prime! (4031.177000 seconds) (digits:26312) Ian Brown 05/2003

 Primality testing 145730!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.05%
 145730!20-1 is prime! (7351.125000 seconds) (digits:34463) Ian Brown p90 07/2003

 Primality testing 148130!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.00%
 148130!20-1 is prime! (2474.578000 seconds) (digits:35083) Ian Brown p90 07/2003

 Primality testing 154822!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.47%
 154822!20-1 is prime! (2008.524000 seconds) (digits:36816) Ian Brown p90 07/2003

 Primality testing 179570!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 34.41%
 179570!20-1 is prime! (2374.4008s+0.0916s) (digits:43279) Ken Davis p104 11/2003

 Primality testing 197930!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 34.11%
 197930!20-1 is prime! (4125.0019s+0.0661s) (digits:48122) Ken Davis p104 04/2004

 Primality testing 198448!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.47%
 198448!20-1 is prime! (1996.1231s+0.0861s) (digits:48259) Ken Davis p104 04/2004

 Primality testing 212518!20-1 [N-1/N+1, Brillhart-Lehmer-Selfridge]  
 Running N-1 test using base 5  
 Running N+1 test using discriminant 11831, base 2+sqrt(11831)  
 Running N+1 test using discriminant 11831, base 3+sqrt(11831)  
 Calling N+1 BLS with factored part 100.00% and helper 0.00% (300.00% proof)  
 212518!20-1 is prime! (3676.1650s+0.0954s) (digits:51997) Marian Otremba 06/2013

 Primality testing 260240!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 35.66%
 260240!20-1 is prime! (-1335.4273s+0.0700s) (digits:64817) Masataka Oita g276 12/2004

 Primality testing 288574!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Calling Brillhart-Lehmer-Selfridge with factored part 33.63%
 288574!20-1 is prime! (-1746.1573s+0.0800s) (digits:72521) Masataka Oita p176 08/2005

 Primality testing 394982!20-1 [N-1/N+1, Brillhart-Lehmer-Selfridge]  
 Running N-1 test using base 5  
 Running N+1 test using discriminant 22229, base 1+sqrt(22229)  
 Running N+1 test using discriminant 22229, base 2+sqrt(22229)  
 Calling N+1 BLS with factored part 100.00% and helper 0.00% (300.00% proof)  
 394982!20-1 is prime! (15909.1428s+0.3434s) (digits:101954) Marian Otremba 08/2013

 Primality testing 413600!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Running N+1 test using discriminant 20693, base 1+sqrt(20693)
 Calling Brillhart-Lehmer-Selfridge with factored part 34.28%
 413600!20-1 is prime! (812.9162s+0.2641s)(digits:107173) Marian Otremba 06/2021

 Primality testing 556042!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Running N+1 test using discriminant 5, base 1+sqrt(5)
 Calling Brillhart-Lehmer-Selfridge with factored part 33.38%
 556042!20-1 is prime! (1468.4664s+0.4718s)(digits:147655) Marian Otremba 06/2021

 Primality testing 628492!20-1 [N+1, Brillhart-Lehmer-Selfridge]
 Running N+1 test using discriminant 39397, base 1+sqrt(39397)
 Calling Brillhart-Lehmer-Selfridge with factored part 33.40%
 628492!20-1 is prime! (1956.8967s+1.0969s)(digits:168565) Marian Otremba 06/2021