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Search: id:A139855
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| A139855 |
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Primes of the form 4x^2+4xy+31y^2. |
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+0
3
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| 31, 79, 151, 199, 271, 439, 631, 751, 919, 991, 1039, 1231, 1279, 1399, 1471, 1759, 1831, 1879, 1951, 1999, 2239, 2311, 2551, 2671, 2719, 2791, 3079, 3271, 3319, 3391, 3511, 3559, 3631, 3919, 4111, 4159, 4231, 4519, 4591, 4639, 4759, 4831
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-480. See A139827 for more information.
Also primes of the form 15x^2+16y^2, which has discriminant=-960. - T. D. Noe (noe(AT)sspectra.com), May 07 2008
Also primes of the form 16x^2+8xy+31y^2, which has discriminant -1920. 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 {31, 79} (mod 120).
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MATHEMATICA
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QuadPrimes[4, -4, 31, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A165615 A142408 A033220 this_sequence A139901 A044169 A044550
Adjacent sequences: A139852 A139853 A139854 this_sequence A139856 A139857 A139858
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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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