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 2020-06-11, 20:13 #257 carpetpool     "Sam" Nov 2016 22·34 Posts I don't suppose newpgen + pfgw would be faster than twinsieve ? Here are the twin primes bases up to 48: Code: k*b^n+-1 with k <= n base = 3 (check to n=15000) 2*3^2+1 8*3^10+1 4*3^15+1 10*3^22+1 10*3^102+1 76*3^139+1 928*3^988+1 476*3^1483+1 2618*3^4286+1 2926*3^11071+1 --- base = 5 (check to n=2000) 12*5^51+1 84*5^103+1 156*5^202+1 336*5^765+1 --- base = 6 (check to n=2000) 1*6^1+1 2*6^2+1 2*6^3+1 2*6^4+1 3*6^6+1 17*6^35+1 23*6^67+1 143*6^162+1 187*6^251+1 152*6^279+1 157*6^371+1 257*6^824+1 430*6^1318+1 1743*6^1916+1 613*6^1922+1 --- base = 7 (check to n=2000) (none) --- base = 10 (check to n=2000) 3*10^3+1 3*10^7+1 126*10^182+1 525*10^632+1 --- base = 11 (check to n=2000) 1182*11^1409+1 --- base = 12 (check to n=2000) 1*12^1+1 4*12^5+1 4*12^15+1 860*12^967+1 --- base = 13 (check to n=2000) 180*13^202+1 228*13^428+1 --- base = 14 (check to n=2000) (none) --- base = 15 (check to n=2000) 2*15^10+1 14*15^14+1 2*15^20+1 238*15^353+1 --- base = 17 (check to n=2000) (none) --- base = 18 (check to n=2000) 1*18^1+1 9*18^11+1 231*18^307+1 357*18^1664+1 --- base = 19 (check to n=2000) (none) --- base = 20 (check to n=2000) 24*20^36+1 3*20^69+1 105*20^152+1 --- base = 21 (check to n=2000) 8*21^26+1 22*21^26+1 30*21^44+1 52*21^55+1 418*21^1919+1 --- base = 22 (check to n=2000) (none) --- base = 23 (check to n=2000) (none) --- base = 24 (check to n=2000) 13*24^23+1 10*24^66+1 --- base = 26 (check to n=2000) 210*26^742+1 837*26^1244+1 --- base = 28 (check to n=2000) 12*28^16+1 --- base = 29 (check to n=2000) (none) --- base = 30 (check to n=2000) 1*30^1+1 14*30^43+1 141*30^169+1 14*30^262+1 446*30^504+1 1389*30^1563+1 --- base = 31 (check to n=2000) 168*31^183+1 --- base = 33 (check to n=2000) (none) --- base = 34 (check to n=2000) 3*34^11+1 255*34^676+1 828*34^856+1 --- base = 35 (check to n=2000) 930*35^1167+1 --- base = 37 (check to n=2000) (none) --- base = 38 (check to n=2000) 3*38^10+1 9*38^53+1 45*38^111+1 --- base = 39 (check to n=2000) 608*39^706+1 --- base = 40 (check to n=2000) 30*40^39+1 3*40^324+1 273*40^326+1 132*40^574+1 --- base = 41 (check to n=2000) 168*41^261+1 312*41^1208+1 --- base = 42 (check to n=2000) 1*42^1+1 5*42^9+1 6*42^57+1 90*42^121+1 53*42^158+1 652*42^746+1 --- base = 43 (check to n=2000) 30*43^1525+1 --- base = 44 (check to n=2000) 3*44^9+1 --- base = 45 (check to n=2000) 2*45^8+1 84*45^84+1 268*45^318+1 136*45^768+1 308*45^970+1 --- base = 46 (check to n=2000) 18*46^25+1 267*46^358+1 --- base = 47 (check to n=2000) (none) --- base = 48 (check to n=2000) 4*48^7+1 2*48^8+1 3*48^8+1 24*48^323+1 30*48^673+1 --- Last fiddled with by carpetpool on 2020-06-11 at 20:14