Riesel primes of the form 7•2ⁿ-1

Current data

`k` , `b` :	7 , 2
Type :	Low
Count :	24
Nash :	912
Max `n` :	12,000,000
Date :	2024-06-13

1, 5, 9^[1], 17, 21^[2], 29^[3], 45^[4], 177^[5], 18381^[6], 22529, 24557, 26109^[7], 34857^[8], 41957, 67421, 70209^[9], 169085, 173489, 177977, 363929, 372897^[10], 5229669^[11], 10612737^[12], 12286041^[13]

Remarks :

The sequence A001771 in OEIS
See also Williams 7•8ⁿ-1

Notes

History

2024-06-13: Checked n = 5000000 - 12000000, Ryan Propper
2023-06-10: Found n = 12286041, Ryan Propper
2022-05-19: Found n = 10612737, Ryan Propper
2021-07-23: Found n = 5229669, Ryan Propper
2021-07-23: Reserved by Ryan Propper, for n = 5000000 - 8000000
2021-06-17: Checked n = 1000000 - 5000000, Gary Barnes, released, double-check for n = 1000000 - 4230000, results included
2021-05-10: Reserved by Gary Barnes, for n = 1000000 - 5000000
2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double-check, results included
2014-10-05: Checked n = 3750000 - 4230000, Predrag Minovic
2013-09-08: Checked n = 3650000 - 3750000, Predrag Minovic
2013-07-09: Checked n = 3260000 - 3499000, 3599000 - 3650000, Predrag Minovic
2013-01-04: Checked n = 3130000 - 3260000, Predrag Minovic
2012-07-02: Checked n = 3110000 - 3130000, Predrag Minovic
2012-05-04: Checked n = 3060000 - 3110000, Predrag Minovic
2012-03-04: Checked n = 3024000 - 3060000, Predrag Minovic
2011-12-31: Checked n = 2770000 - 2995000, 3021000 - 3024000, Predrag Minovic
2011-06-04: Checked n = 2730000 - 2770000, Predrag Minovic
2011-04-12: Checked n = 2710000 - 2730000, Predrag Minovic
2011-03-05: Checked n = 2670000 - 2710000, Predrag Minovic
2011-01-13: Checked n = 2600000 - 2670000, Predrag Minovic
2010-09-05: Checked n = 2580000 - 2600000, Predrag Minovic
2010-07-18: Checked n = 2550000 - 2580000, Predrag Minovic
2010-06-05: Checked n = 2530000 - 2550000, Predrag Minovic
2010-05-04: Checked n = 2510000 - 2530000, Predrag Minovic
2010-04-11: Checked n = 2500000 - 2510000, Predrag Minovic
2010-01-17: Checked n = 2450000 - 2500000, Predrag Minovic
2009-11-03: Checked n = 2300000 - 2366000, 2429000 - 2450000, Predrag Minovic
2009-08-09: Checked n = 2260000 - 2300000, Predrag Minovic
2009-07-26: Checked n = 2250000 - 2260000, Predrag Minovic, See range done at RPS other completed ranges.
2009-04-04: Checked n = 2070000 - 2250000, Predrag Minovic
2009-01-18: Checked n = 3499065 - 3599021, Peter Benson
2009-01-10: Reserved by Predrag Minovic, for n = 2210000 - 2366000
2009-01-09: Checked n = 950000 - 1077548, 1967625 - 2125917, 2366465 - 2429865, 2995329 - 3021009, Peter Benson
2008-02-24: Checked n = 1600000 - 2070000, Predrag Minovic
2006-10-13: Checked n = 1300000 - 1600000, Predrag Minovic
2005-10-04: Checked n = 1180000 - 1300000, Predrag Minovic
2005-03-22: Checked n = 1100000 - 1180000, Predrag Minovic
2004-12-30: Checked n = 1050000 - 1100000, Predrag Minovic
2004-12-04: Checked n = 1012000 - 1050000, Predrag Minovic
2004-10-11: Checked n = 1000000 - 1012000, Predrag Minovic
2004-08-03: Checked n = 920000 - 1000000, Predrag Minovic
2004-07-13: Checked n = 675000 - 920000, Predrag Minovic
2004-06-14: Checked n = 520000 - 675000, Predrag Minovic
2004-05-18: Checked n = 415000 - 520000, Predrag Minovic
2004-05-09: Checked n = 324000 - 415000, Predrag Minovic
2004-05-09: Found n = 372897, Predrag Minovic
2004-05-02: Checked n = 350000 - 360000, 400000 - 424000, Phil Carmody, released
2004-05-02: Checked to n = 312744, Phil Carmody
2004-05-01: Checked to n = 359000?, Phil Carmody correction posted on 2004-05-02
2004-04-30: Checked n = 230000 - 324000, 350000 - 366000, Predrag Minovic
2004-04-30: Found n = 363929, Predrag Minovic
2004-04-26: Checked n = 195000 - 230000, 240000 - 262000, 280000 - 288000, Predrag Minovic
2004-04-07: Checked n = 195000 - 203000, 213000 - 220000, Predrag Minovic
2004-04-01: Reserved by Predrag Minovic
2000-02-07: Found n = 177977, Ingo Buechel, Wilfrid Keller
2000-01-01: Found n = 173489, Ingo Buechel, Wilfrid Keller
1999-12-01: Found n = 169085, Ingo Buechel, Wilfrid Keller
1998-12-26: Found n = 70209, Ingo Buechel, Wilfrid Keller
1998-12-23: Found n = 67421, Ingo Buechel, Wilfrid Keller
1998-08-31: Found n = 41957, Wilfrid Keller
1998-07-28: Found n = 34857, Wilfrid Keller
1998-06-14: Found n = 26109, Wilfrid Keller
1998-06-14: Found n = 24557, Wilfrid Keller
1998-06-14: Found n = 22529, Wilfrid Keller
1998-04-09: Found n = 18381, Ray Ballinger

[1] Williams 7•8³-1

[2] Woodall 7•8⁷-1, C:Williams 7•8⁷-1

[3] Near Woodall 28•2²⁷-1

[4] Williams 7•8¹⁵-1

[5] Williams 7•8⁵⁹-1

[6] Williams 7•8⁶¹²⁷-1

[7] Williams 7•8⁸⁷⁰³-1

[8] Williams 7•8¹¹⁶¹⁹-1

[9] Williams 7•8²³⁴⁰³-1

[10] Williams 7•8¹²⁴²⁹⁹-1

[11] Williams 7•8^1743223-1

[12] Williams 7•8^3537579-1

[13] Williams 7•8^4095347-1

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Riesel primes of the form 7•2ⁿ-1

Current data

Notes

History

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Riesel primes of the form 7•2n-1

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Riesel primes of the form 7•2ⁿ-1