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Search: id:A107151
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| A107151 |
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Primes of the form 5x^2+9y^2. |
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+0
4
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| 5, 29, 41, 89, 101, 149, 269, 281, 389, 401, 449, 461, 509, 521, 569, 641, 701, 761, 809, 821, 881, 929, 941, 1049, 1061, 1109, 1181, 1229, 1289, 1301, 1361, 1409, 1481, 1601, 1709, 1721, 1889, 1901, 1949, 2069, 2081, 2129, 2141, 2309, 2381
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-180. See A107132 for more information.
Except for 5, also primes of the form 9x^2+6xy+26y^2. See A140633. - T. D. Noe (noe(AT)sspectra.com), May 19 2008
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FORMULA
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Except for 5, the primes are congruent to {29, 41} (mod 60). - T. D. Noe (noe(AT)sspectra.com), May 02 2008
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MATHEMATICA
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QuadPrimes[5, 0, 9, 10000] (* see A106856 *)
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CROSSREFS
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Cf. A139827.
Sequence in context: A091729 A033205 A167742 this_sequence A117746 A156053 A081116
Adjacent sequences: A107148 A107149 A107150 this_sequence A107152 A107153 A107154
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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 13 2005
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