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Search: id:A139992
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| A139992 |
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Primes of the form 20x^2+20xy+47y^2. |
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+0
2
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| 47, 167, 383, 503, 647, 887, 983, 1223, 1487, 1823, 1847, 2063, 2663, 2687, 2903, 3023, 3167, 3407, 3527, 3863, 4007, 4583, 4703, 5087, 5927, 6047, 6263, 6863, 7103, 7607, 7703, 7727, 8447, 8543, 8783, 9623, 9743, 9887, 10223, 10247, 10463
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-3360. See A139827 for more information.
Also primes of the forms 47x^2+40xy+80y^2 and 47x^2+42xy+63y^2. See A140633. - T. D. Noe (noe(AT)sspectra.com), May 19 2008
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FORMULA
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The primes are congruent to {47, 143, 167, 383, 503, 647} (mod 840).
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MATHEMATICA
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QuadPrimes[20, -20, 47, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A141994 A132251 A078857 this_sequence A142916 A158632 A142413
Adjacent sequences: A139989 A139990 A139991 this_sequence A139993 A139994 A139995
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KEYWORD
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nonn,easy
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), May 02 2008
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