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A222963
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a(n) = (p-3)*(p+3)/4 where p is the n-th prime.
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1
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0, 4, 10, 28, 40, 70, 88, 130, 208, 238, 340, 418, 460, 550, 700, 868, 928, 1120, 1258, 1330, 1558, 1720, 1978, 2350, 2548, 2650, 2860, 2968, 3190, 4030, 4288, 4690, 4828, 5548, 5698, 6160, 6640, 6970, 7480, 8008, 8188
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OFFSET
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2,2
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COMMENTS
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Old name was: Numbers n such that sqrt(4*n+9) is prime.
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LINKS
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FORMULA
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MATHEMATICA
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Select[Range[0, 10000], PrimeQ[Sqrt[4 # + 9]]&]
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PROG
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(Magma) [(p^2-9)/4: p in PrimesInInterval(3, 200)];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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