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A187714
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Odd numbers m divisible by 3 such that for every k >= 1, m*2^k - 1 has a divisor in the set {5, 7, 11, 13, 17, 19, 31, 37, 41, 61, 73, 109, 151, 241, 331}.
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4
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7148695169714208807, 17968583418362170239, 26363076126393718191, 57376760867272385247, 67950587841687767283, 73873959473901564111, 81055172741266754727, 96217896533288105991, 104173338506128098489
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OFFSET
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1,1
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COMMENTS
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Wilfrid Keller (2004, published) gave the first known example.
7148695169714208807 computed in 2017 by the author.
Conjecture: 7148695169714208807 is the smallest Riesel number that is divisible by 3. - Arkadiusz Wesolowski, May 12 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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