Riesel primes of the form 19401•2n-1

Current data

k , b : 19401 , 2  (sieve) Type : 3 Count : 16 Nash : 1081 Max n : 1,000,000 Date : 2023-12-07

5, 9, 131, 275, 281, 365, 383, 2133, 3705, 6575, 9299, 10089, 18335, 31353, 297509, 3086450

Remarks :

For additional even n history, see CRUS Liskovets-Gallot search at Riesel 19401•4n-1. Sieves: p=800T, 28892 odd n candidates 1000000<n≤3100000; p=15T, 17947 even n candidates 150000<n≤3100000

History

• 2023-12-07: Checked n = 600000-1000000 (only odd n), Alexander Jones
• 2023-03-23: Checked n = 500000-600000 (only odd n), Alexander Jones
• 2023-03-14: Sieve file created: n = 600000-3100000 (all n), 150000-600000 (only even n), Alexander Jones, yoyo@home
• 2022-03-31: Checked n = 300000-500000 (only odd n), Alexander Jones
• 2022-01-10: Checked n = 150000-300000 (only odd n), Alexander Jones
• 2021-12-22: Checked to n = 150000, Alexander Jones
• 2015-06-13: Found n = 3086450, Gary Barnes, CRUS Liskovets-Gallot
• 2015-04-29: Checked to n = 3000000 (only even n), (PRPnet port 1400), Conjectures 'R Us
• 2008-01-19: Checked to n = 132000, Karsten Bonath