Riesel primes of the form 121•2n-1

Reserved! This sequence is currently reserved by: PrimeGrid

Current data

k , b : 121 , 2 Type : Low Count : 35 Nash : 965 Max n : 9,119,901 Date : 2020-03-11 Reserved : PrimeGridPrimeGrid/Reserved

1, 3, 21, 27, 37, 43, 91, 117, 141, 163, 373, 421, 1581, 2035, 10701, 18931, 21307, 51195, 64579, 156541, 302097, 334257, 368059, 383061, 410131, 494317, 541621, 990219, 1039965, 1526097, 1589157, 1695499, 1954243, 2033941, 4553899

Remarks :

LLR status at PrimeGrid

History

• 2012-02-25: Found n = 4553899, Timothy D. Winslow, (Official announcement)
• 2007-12-02: Checked to n = 3016000, Justin Van Klein???
• 2006-01-28: Found n = 2033941, Szymon Banka
• 2006-01-20: Found n = 1954243, Szymon Banka
• 2005-09-06: Found n = 1695499, Rodger M. Ewing
• 2005-10-24: Found n = 1589157, Frank Clowes
• 2005-07-18: Found n = 1526097, Frank Clowes
• 2004-11-07: Found n = 1039965, Frank Clowes
• 2004-08-13: Found n = 990219, Dr. Michael E. Haas
• 2004-06-02: Found n = 541621, Frank Clowes
• 2004-06-02: Found n = 494317, Dr. Michael E. Haas
• 2004-07-21: Found n = 410131, Frank Clowes
• 2004-06-02: Found n = 383061, JF Boyer
• 2004-05-31: Found n = 368059, JF Boyer
• 2004-06-08: Found n = 334257, Rodger M. Ewing
• 2004-05-27: Found n = 302097, Rodger M. Ewing