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A271143
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Numbers k such that 42*k^3 + 270*k^2 - 26436*k + 250703 is prime.
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12
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 43, 44, 48, 51, 54, 55, 56, 58, 61, 62, 63, 64, 65, 66, 67, 69, 71, 76, 78, 79, 84, 87, 88, 89, 90, 92
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OFFSET
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1,3
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COMMENTS
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40 is the first value not in the sequence.
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LINKS
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EXAMPLE
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4 is in this sequence since 42*4^3 + 270*4^2 - 26436*4 + 250703 = 151967, which is prime.
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MATHEMATICA
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Select[Range[0, 100], PrimeQ[42#^3 + 270#^2 - 26436# + 250703] &]
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PROG
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CROSSREFS
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Cf. A050265-A050268, A005846, A007641, A007635, A048988, A256585, A271980, A272074, A272075, A272160, A271144.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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