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Search: id:A139837
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| A139837 |
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Primes of the form 4x^2+4xy+23y^2. |
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+0
2
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| 23, 31, 47, 71, 103, 191, 199, 223, 311, 367, 383, 463, 487, 599, 631, 647, 719, 727, 751, 823, 839, 863, 911, 983, 991, 1039, 1087, 1103, 1279, 1303, 1367, 1423, 1439, 1511, 1543, 1567, 1607, 1783, 1831, 1871, 1879, 1951, 2039, 2143, 2311, 2399
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-352. See A139827 for more information.
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FORMULA
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The primes are congruent to {15, 23, 31, 47, 71} (mod 88).
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MATHEMATICA
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QuadPrimes[4, -4, 23, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A031924 A162587 A033216 this_sequence A145375 A086547 A054291
Adjacent sequences: A139834 A139835 A139836 this_sequence A139838 A139839 A139840
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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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