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A089238
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Numbers n such that 3*n^2/2 - 1 is a prime.
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0
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2, 4, 6, 10, 14, 16, 20, 24, 26, 34, 40, 44, 54, 56, 60, 64, 70, 76, 86, 90, 104, 110, 116, 120, 124, 126, 130, 136, 140, 146, 150, 154, 164, 166, 174, 186, 194, 200, 204, 230, 240, 244, 260, 264, 286, 300, 306, 336, 346, 354, 374, 386, 394, 400, 414, 416, 420
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OFFSET
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1,1
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COMMENTS
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REFERENCES
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M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997
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LINKS
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MATHEMATICA
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Select[Range[0, 500, 2], PrimeQ[(3#^2)/2-1]&] (* Harvey P. Dale, Jul 03 2017 *)
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PROG
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(PARI) forstep(n=2, 1000, 2, if(isprime(3*n^2/2-1), print1(n, ", "))) - Rick L. Shepherd, May 06 2008
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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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