Riesel primes of the form 123•2ⁿ-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 1.

Current data

`k` , `b` :	123 , 2
Type :	3
Count :	53
Nash :	2133
Max `n` :	2,800,000
Date :	2024-11-13
Reserved :	No Prime Left BehindNo Prime Left Behind/Reserved

2^[1], 3, 11, 15, 23^[2], 24, 27, 35, 71, 84, 108, 122^[3], 123^[4], 138, 236, 242, 290, 392, 500, 611, 747, 771, 1106, 1490, 3560, 5111, 6066, 8660, 8927, 19451, 19730, 28316, 30471, 49515, 93762, 117083, 168435, 206663, 249242, 255402, 261530, 355727, 389052, 516456, 518540, 521031, 939098, 958050, 968927, 1225115, 1241690, 1779728, 2583362

Notes

↑ Sophie Germain n=2
↑ Sophie Germain n=23
↑ Sophie Germain n=122, Near Woodall 123•2¹²²-1
↑ Woodall 123•2¹²³-1

History

2024-08-18: Found n = 2583362, Gary Barnes, NPLB K300 Drive 1
2024-05-16: Reserved by NPLB K300 Drive 1 for n > 2300000
2022-04-10: Checked to n = 2300000, RPS Megabit Drive 2
2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
2019-08-18: Checked to n = 2200000, RPS Megabit Drive 2
2014-10-16: Found n = 1779728, Kai Inouye, RPS Megabit Drive 2
2011-07-23: Found n = 1241690, David Metcalfe, RPS Megabit Drive 2
2011-07-15: Found n = 1225115, David Metcalfe, RPS Megabit Drive 2
2011-04-28: Reserved by RPS Megabit Drive 2 for n > 1000000
2009-09-14: Checked n = 700000 - 1000000, RPS Drive 9ks, released
2009-09-04: Found n = 958050, Carlos Eduardo Pinho, RPS Drive 9ks
2009-08-26: Found n = 968927, Carlos Eduardo Pinho, RPS Drive 9ks
2009-08-24: Found n = 939098, Thomas Ritschel, RPS Drive 9ks
2007-12-03: Reserved by RPS Drive 9ks for n = 700000 - 1000000
2007-02-02: Checked to n = 700000, Thomas Masser, released
2005-10-05: Checked to n = 700000, Thomas Masser
2005-05-19: Found n = 518540, Thomas Masser
2005-05-19: Found n = 516456, Thomas Masser
2005-05-18: Found n = 521031, Thomas Masser
2005-03-08: Found n = 389052, Thomas Masser
2005-01-06: Checked to n = 380000, Thomas Masser
2005-01-04: Checked n = 200000 - <300000, Thomas Masser
2004-05-23: Found n = 355727, Mark Anderson
2004-04-10: Found n = 261530, Mark Anderson
2004-04-09: Found n = 255402, Mark Anderson
2004-04-08: Found n = 249242, Mark Anderson
2004-04-01: Found n = 206663, Mark Anderson
2004-04-01: Reserved by Mark Anderson
2004-03-29: Found n = 168435, Mark Anderson
1989: Found n = 8927, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown

[1] Sophie Germain n=2

[2] Sophie Germain n=23

[3] Sophie Germain n=122, Near Woodall 123•2¹²²-1

[4] Woodall 123•2¹²³-1

[1]

[2]

[3]

[4]

Riesel primes of the form 123•2ⁿ-1

Current data

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Riesel primes of the form 123•2n-1

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Riesel primes of the form 123•2ⁿ-1