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Search: id:A139511
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| A139511 |
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Primes of the form x^2+31x*y+y^2. |
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+0
2
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| 67, 103, 181, 199, 223, 313, 397, 463, 487, 499, 631, 643, 661, 691, 709, 883, 991, 1021, 1039, 1093, 1153, 1213, 1321, 1483, 1543, 1567, 1741, 1747, 1753, 1831, 1879, 2017, 2029, 2083, 2113, 2137, 2179, 2203, 2269, 2311, 2377, 2539, 2557, 2677, 2731
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OFFSET
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1,1
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MATHEMATICA
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a = {}; w = 31; k = 1; Do[Do[If[PrimeQ[n^2 + w*n*m + k*m^2], AppendTo[a, n^2 + w*n*m + k*m^2]], {n, m, 400}], {m, 1, 400}]; Union[a] (*Artur Jasinski*)
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CROSSREFS
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Cf. A139489, A007645, A068228, A007519, A033212, A033212, A107152, A107008, A033215, A107145, A139490, A139491.
Adjacent sequences: A139508 A139509 A139510 this_sequence A139512 A139513 A139514
Sequence in context: A071958 A128197 A136077 this_sequence A044190 A044571 A106755
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KEYWORD
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nonn,new
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 24 2008
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