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A110558
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Numbers n such that (n^2-8)/8 is prime.
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5
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8, 12, 16, 24, 28, 32, 40, 44, 52, 60, 68, 72, 84, 88, 96, 100, 112, 136, 144, 152, 156, 164, 168, 172, 180, 184, 196, 200, 208, 224, 236, 248, 252, 256, 276, 292, 304, 320, 324, 340, 348, 364, 368, 380, 392, 408, 432, 436, 448, 452, 460, 472, 500, 504, 508
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OFFSET
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1,1
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COMMENTS
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These numbers need to be of the form 4*j then (16*j^2-8)/8 = 2*j^2-1.
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LINKS
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FORMULA
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MATHEMATICA
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Select[Range[510], PrimeQ[(#^2-8)/8]&] (* Harvey P. Dale, Feb 03 2011 *)
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PROG
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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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