RPS Megabit Drive 2

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Purpose

The goal of this drive is to search for primes of the form k•2ⁿ-1 for k ≤ 300 and n > 1000000.

Started

• 2011-04-28

Ended

• ongoing

k-values

2011-04-28: k = 115, 117, 123, 129, 135, 147, 149, 153, 155, 157, 159, 171, 173, 175, 179, 183, 185, 189, 193 for 1,000,000 ≤ n ≤ 1,100,000

2011-06-03: extending all k for n > 1,100,000

2015-06-19: adding k = 131, 133, 137, 139, 141, 143, 145, 161, 177, 181, 187 for n > 2,000,000

2020-03-20: removing k = 193 for n > 2,200,000

currently k = 115, 117, 123, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 153, 155, 157, 159, 161, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189

Multi Reservation

• Here: The current n_max = 5,000,000 as of 2023-07-11.

Data table

Number of candidates for n ≤ 2300000.

k-value	Nash	Candidates	n-range	prime(s) for n
115	1954	43318	1000000 -	1141719, 1524183
117	3581	77288	1000000 -	1104138, 1210282, 1302764, 1554601, 1618434, 2117600
123	2133	45841	1000000 -	1225115, 1241690, 1779728
129	2753	59465	1000000 -	1376223
131	1065	5491	2000000 -
133	1442	7097	2000000 -
135	2322	51611	1000000 -	1288177, 2180256
137	1109	5321	2000000 -	2244398
139	2586	12577	2000000 -
141	1901	9565	2000000 -
143	2243	10886	2000000 -	2007888
145	1098	5497	2000000 -
147	2806	59973	1000000 -	1273684, 1374216, 1499333
149	1022	21856	1000000 -	1054092, 1138804, 1541152, 1945668
153	3189	68668	1000000 -	1215327, 1245154
155	1317	28793	1000000 -	1207424
157	917	19652	1000000 -	1085121
159	2237	47564	1000000 -	1004981, 1240229, 2081069
161	1273	6598	2000000 -
171	2674	57576	1000000 -	1362662, 1575999
173	1999	43684	1000000 -	1098914, 1504740
175	1792	38811	1000000 -	1065181, 1162313, 1571521, 1711779
177	1622	8047	2000000 -
179	779	16772	1000000 -	1464720, 1636808
181	2940	14832	2000000 -
183	1685	37510	1000000 -	1095896, 1219415, 1618775, 1707182
185	2161	46011	1000000 -	1234730, 2127966, 2264906
187	1158	5596	2000000 -	2172693
189	2793	60909	1000000 -	1547744
193	760	15530	1000000 - 2200000	1268399

External Links

• Thread at MersenneForum

Riesel Prime Search

Miscellaneous

Main

Current work

Megabit Drive‎ 1

Completed

Drive 1 Drive 2 Drive 3 Drive 4 Drive 5 Drive 6 Drive 7 Drive 8 Drive 9 Drive 10 Drive 11 Drive 12 Megabit Drive‎ 2 Megabit Drive‎ 3

Individual k-searches

k=5 k=15 k=17

Others