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Search: id:A139998
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| A139998 |
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Primes of the form 31x^2+22xy+31y^2. |
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+0
3
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| 31, 199, 271, 439, 1039, 1231, 1279, 1399, 1879, 1951, 2239, 2551, 2719, 2791, 3079, 3391, 3559, 3631, 3919, 4231, 4591, 4639, 4759, 5431, 5479, 6079, 6151, 6271, 6991, 7159, 7591, 7759, 7951, 8431, 8599, 8839, 9439, 9511, 9631, 9679
(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 31x^2+18xy+111y^2 and 31x^2+10xy+55y^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 {31, 199, 271, 391, 439, 559} (mod 840).
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CROSSREFS
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Sequence in context: A023292 A100689 A055816 this_sequence A142654 A137657 A125341
Adjacent sequences: A139995 A139996 A139997 this_sequence A139999 A140000 A140001
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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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