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Search: id:A139507
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| A139507 |
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Primes of the form x^2 + 27x*y + y^2 for x and y nonnegative. |
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+0
2
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| 29, 59, 199, 239, 281, 349, 419, 431, 439, 521, 571, 631, 719, 811, 821, 919, 941, 1009, 1019, 1021, 1039, 1069, 1151, 1231, 1301, 1321, 1459, 1579, 1789, 1831, 1861, 1889, 1949, 1979, 2029, 2039, 2089, 2111, 2141, 2269, 2311, 2411, 2441, 2609, 2659, 2789
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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a = {}; w = 27; 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.
Sequence in context: A042670 A129813 A060229 this_sequence A104119 A042674 A078948
Adjacent sequences: A139504 A139505 A139506 this_sequence A139508 A139509 A139510
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 24 2008
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