Riesel primes of the form 2•3n-1

Current data

k , b : 2 , 3 Count : 38 Nash : 2685 Max n : 2,000,000 Date : 2024-08-01

1, 2, 3, 7, 8, 12, 20, 23, 27, 35, 56, 62, 68, 131, 222, 384, 387, 579, 644, 1772, 3751, 5270, 6335, 8544, 9204, 12312, 18806, 21114, 49340, 75551, 90012, 128295, 143552, 147488, 1010743, 1063844, 1360104, 2834778

Remarks :

See H.C.Williams, C.R.Zarnke: "Some prime numbers of the forms 2A3^n+1 and 2A3^n-1" Math. Comp. 26 (1972), 995-998 The sequence A003307 in OEIS See also Williams 2•3n-1

History

• 2024-08-01: Found n = 2834778, Ryan Propper
• 2021-01-26: Checked to n = 2000000, Borys Jaworski, released
• 2020-04-04: Checked to n = 2000000, Borys Jaworski
• 2020-01-03: Checked to n = 2000000, Borys Jaworski
• 2019-10-05: Checked to n = 1940000, Borys Jaworski
• 2019-09-05: Checked to n = 1930000, Borys Jaworski
• 2019-03-01: Checked to n = 1840000, Borys Jaworski
• 2019-01-01: Checked to n = 1810000, Borys Jaworski
• 2018-11-30: Checked to n = 1800000, Borys Jaworski
• 2018-11-01: Checked to n = 1780000, Borys Jaworski
• 2018-09-02: Checked to n = 1760000, Borys Jaworski
• 2018-05-03: Checked to n = 1720000, Borys Jaworski
• 2018-02-02: Checked to n = 1690000, Borys Jaworski
• 2018-01-01: Checked to n = 1680000, Borys Jaworski
• 2017-12-02: Checked to n = 1670000, Borys Jaworski
• 2017-10-27: Checked to n = 1660000, Borys Jaworski
• 2017-07-02: Checked to n = 1630000, Borys Jaworski
• 2017-05-02: Checked to n = 1610000, Borys Jaworski
• 2017-04-01: Checked to n = 1600000, Borys Jaworski
• 2017-01-31: Checked to n = 1570000, Borys Jaworski
• 2017-01-01: Checked to n = 1560000, Borys Jaworski
• 2016-11-30: Checked to n = 1550000, Borys Jaworski
• 2016-11-01: Checked to n = 1550000, Borys Jaworski
• 2016-10-01: Checked to n = 1550000, Borys Jaworski
• 2016-08-31: Checked to n = 1550000, Borys Jaworski
• 2016-07-01: Checked to n = 1540000, Borys Jaworski
• 2016-06-01: Checked to n = 1530000, Borys Jaworski
• 2016-04-30: Checked to n = 1510000, Borys Jaworski
• 2016-03-31: Checked to n = 1490000, Borys Jaworski
• 2016-02-29: Checked to n = 1480000, Borys Jaworski
• 2016-02-01: Checked to n = 1470000, Borys Jaworski
• 2016-01-03: Checked to n = 1450000, Borys Jaworski
• 2015-11-30: Checked to n = 1430000, Borys Jaworski
• 2015-10-31: Checked to n = 1420000, Borys Jaworski
• 2015-08-31: Checked to n = 1390000, Borys Jaworski
• 2015-07-31: Found n = 1360104, Borys Jaworski
• 2015-06-01: Checked to n = 1350000, Borys Jaworski
• 2015-05-01: Checked to n = 1350000, Borys Jaworski
• 2015-03-31: Checked to n = 1350000, Borys Jaworski
• 2015-02-28: Checked to n = 1340000, Borys Jaworski
• 2015-02-01: Checked to n = 1330000, Borys Jaworski
• 2015-01-03: Checked to n = 1320000, Borys Jaworski
• 2014-11-01: Checked to n = 1300000, Borys Jaworski
• 2014-09-30: Checked to n = 1290000, Borys Jaworski
• 2014-07-30: Checked to n = 1270000, Borys Jaworski
• 2014-06-30: Checked to n = 1260000, Borys Jaworski
• 2014-05-01: Checked to n = 1250000, Borys Jaworski
• 2014-03-31: Checked to n = 1240000, Borys Jaworski
• 2014-03-01: Checked to n = 1240000, Borys Jaworski
• 2013-11-30: Checked to n = 1220000, Borys Jaworski
• 2013-10-31: Checked to n = 1210000, Borys Jaworski
• 2013-09-30: Checked to n = 1200000, Borys Jaworski
• 2013-07-31: Checked to n = 1190000, Borys Jaworski
• 2013-07-01: Checked to n = 1190000, Borys Jaworski
• 2013-06-02: Checked to n = 1180000, Borys Jaworski
• 2013-04-01: Checked to n = 1180000, Borys Jaworski
• 2013-03-02: Checked to n = 1170000, Borys Jaworski
• 2013-01-31: Checked to n = 1170000, Borys Jaworski
• 2012-12-01: Checked to n = 1150000, Borys Jaworski
• 2012-11-01: Checked to n = 1150000, Borys Jaworski
• 2012-09-30: Checked to n = 1140000, Borys Jaworski
• 2012-08-30: Checked to n = 1130000, Borys Jaworski
• 2012-02-12: Found n = 1063844, Borys Jaworski
• 2011-09-01: Found n = 1010743, Borys Jaworski
• 2009-04-12: Checked to n = 570000, David Broadhurst
• 2009-03-09: Checked n = 189000  -  400000, David Broadhurst
• 2004-08-15: Found n = 147488, Ingo Buechel, Wilfrid Keller
• 2004-08-12: Found n = 143552, Ingo Buechel, Wilfrid Keller
• 2003-06-20: Found n = 128295, Ingo Buechel, Wilfrid Keller
• 2001-09-28: Found n = 90012, Wilfrid Keller
• 2001-08-12: Found n = 75551, Wilfrid Keller
• 2001-06-30: Found n = 49340, Wilfrid Keller
• 1972-10: Found n = 1 - 222, Hugh C. Williams, Charles R. Zarnke