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Search: id:A139975
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| A139975 |
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Primes of the form 20x^2+20xy+31y^2. |
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+0
1
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| 31, 71, 151, 239, 271, 359, 431, 479, 631, 839, 1151, 1279, 1319, 1399, 1471, 1831, 1879, 2039, 2111, 2351, 2399, 2671, 2711, 2719, 2879, 3079, 3191, 3271, 3359, 3391, 3671, 3911, 3919, 4231, 4271, 4519, 4591, 4639, 4751, 4799, 4831, 4919
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-2080. See A139827 for more information.
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FORMULA
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The primes are congruent to {31, 71, 111, 119, 151, 239, 271, 279, 319, 359, 431, 479} (mod 520).
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MATHEMATICA
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QuadPrimes[20, -20, 31, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A003542 A055781 A142195 this_sequence A050957 A127345 A127346
Adjacent sequences: A139972 A139973 A139974 this_sequence A139976 A139977 A139978
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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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