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A053354
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Numbers k such that 275*2^k + 1 is prime.
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0
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7, 15, 21, 25, 27, 69, 71, 105, 207, 285, 611, 635, 647, 969, 1127, 1159, 2407, 2529, 3517, 3577, 6275, 6729, 7919, 8809, 9375, 27369, 31657, 44149, 58579, 59355, 274255, 285435, 350949, 485505, 821221, 834297
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Range[5*10^3], PrimeQ[275*2^# + 1] &] (* G. C. Greubel, May 24 2018 *)
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PROG
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(Magma) [n: n in [1..300] | IsPrime(275*2^n+1)]; // G. C. Greubel, May 24 2018
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CROSSREFS
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KEYWORD
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hard,nonn,more
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AUTHOR
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EXTENSIONS
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a(31)-a(36) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018
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STATUS
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approved
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