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A039950
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Primes of form abs(2*n^2-199).
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0
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37, 43, 71, 89, 101, 127, 139, 149, 167, 181, 191, 193, 197, 251, 313, 379, 449, 523, 601, 683, 769, 859, 953, 1051, 1153, 1259, 1483, 1601, 1723, 1979, 2113, 2251, 2393, 2539, 2689, 2843, 3001, 3163, 3329, 3499, 3673, 3851, 4219, 4409, 4603, 4801, 5003
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OFFSET
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1,1
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REFERENCES
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C. Clawson, Mathematical Mysteries, Plenum Press, 1996, p. 173
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LINKS
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MATHEMATICA
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Select[Abs[2*Range[-15, 70]^2-199], PrimeQ]//Union (* Harvey P. Dale, Mar 20 2018 *)
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PROG
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(PARI) isok(n) = isprime(n) && (n != 199) && (issquare((n+199)/2) || issquare((199-n)/2)); \\ Michel Marcus, Sep 28 2013
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CROSSREFS
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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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