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# RPS 2nd Megabit Drive

• 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 nmax = 2,300,000 as of 2022-04-20.

## 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
 Current work
 Completed
 Individual k-searches
 Others