RPS Megabit Drive 2

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• Name: Riesel Prime Search 2nd Megabit Drive
• Purpose: The goal of this drive is to search for primes of the form k•2ⁿ-1 for k=<300 and n>1000000.
• Link: Mersenne Forum
• 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

• n-values:

n > 1000000

Multi Reservation

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

Found primes

115 [2]: 1141719, 1524183

117 [6]: 1104138, 1210282, 1302764, 1554601, 1618434, 2117600

123 [3]: 1225115, 1241690, 1779728

129 [1]: 1376223

131 [0]: -

133 [0]: -

135 [2]: 1288177, 2180256

137 [1]: 2244398

139 [0]: -

141 [0]: -

143 [1]: 2007888

145 [0]: -

147 [3]: 1273684, 1374216, 1499333

149 [4]: 1054092, 1138804, 1541152, 1945668

153 [2]: 1215327, 1245154

155 [1]: 1207424

157 [1]: 1085121

159 [3]: 1004981, 1240229, 2081069

161 [0]: -

171 [2]: 1362662, 1575999

173 [2]: 1098914, 1504740

175 [4]: 1065181, 1162313, 1571521, 1711779

177 [0]: -

179 [2]: 1464720, 1636808

181 [0]: -

183 [4]: 1095896, 1219415, 1618775, 1707182

185 [3]: 1234730, 2127966, 2264906

187 [1]: 2172693

189 [1]: 1547744

193 [1]: 1268399

Range history

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