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# RPS 1st Megabit Drive

• Name: Riesel Prime Search 1st 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.
• Started: 2010-10-24
• Ended: ongoing
• k-values:
2010-10-24: k = 51, 57, 61, 65, 69, 87 for n > 1,000,000
2011-01-26: adding k = 47, 53 for n > 1,000,000
2014-08-12: removing k = 51, 69 for n > 2,500,000
2014-08-12: adding k = 35 for n > 2,520,000, k = 37 for n > 2,500,000 only n != 1 mod 10, k = 103 for n ≥ 2,550,223, and k = 111 for n ≥ 2,601,487
currently k = 35, 37, 47, 53, 57, 61, 65, 87, 103, 111
• n-values:
n > 1000000

## Sieve file

Sieve file for 3,000,000 < n < 4,000,000 available here (LLR-format, 291,383 candidates).

## Found primes

35 [0]: -
37 [0]: -
47 [1]: 1025950
51 [3]: 1026910, 1027635, 1231665
53 [1]: 1632590
57 [6]: 1098272, 1110980, 1486214, 2103370, 2639528, 3093440
61 [8]: 1124049, 1416365, 1487125, 1734983, 2134577, 2381887, 2580689, 2936967
65 [7]: 1374574, 1421088, 1505640, 2450614, 2583720, 2876718, 3080952
69 [5]: 1473217, 1566375, 2174213, 2410035, 2428251
87 [7]: 1089098, 1120006, 1332741, 1358189, 1616138, 1852590, 2518122
103 [0]: -
111 [1]: 3060238

## Range history

Riesel Prime Search
 Miscellaneous
 Current work
 Completed
 Individual k-searches
 Others