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A215439
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Numbers k such that 2^k + k^2 - 1 is prime.
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4
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1, 2, 4, 10, 70, 134, 146, 190, 218, 292, 478, 7136, 15964, 19988, 100790, 111442, 181874, 202112
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Range[0, 9000], PrimeQ[2^# + #^2 - 1] &]
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PROG
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(Magma) [n: n in [0..1000] | IsPrime(2^n+n^2-1)]
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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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