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Search: id:A139847
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| A139847 |
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Primes of the form 6x^2+6xy+19y^2. |
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+0
2
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| 19, 31, 139, 199, 271, 439, 619, 691, 811, 859, 1039, 1231, 1279, 1291, 1399, 1459, 1531, 1699, 1879, 1951, 2131, 2239, 2371, 2539, 2551, 2659, 2719, 2791, 2971, 3079, 3331, 3391, 3499, 3559, 3631, 3919, 4051, 4219, 4231, 4339, 4591, 4639
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-420. See A139827 for more information.
Also primes of the forms 19x^2+12xy+24y^2 and 19x^2+16xy+31y^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 {19, 31, 139, 199, 271, 391} (mod 420).
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MATHEMATICA
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QuadPrimes[6, -6, 19, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A106861 A107168 A125602 this_sequence A087764 A146691 A146784
Adjacent sequences: A139844 A139845 A139846 this_sequence A139848 A139849 A139850
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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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