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Search: id:A139993
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| A139993 |
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Primes of the form 21x^2+40y^2. |
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+0
2
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| 61, 181, 229, 349, 661, 829, 1021, 1069, 1669, 1741, 1861, 2029, 2341, 2749, 3181, 3541, 3709, 4021, 4261, 4549, 4861, 5101, 5701, 5869, 6229, 6709, 6781, 6949, 7069, 7549, 7621, 7741, 7789, 8221, 8389, 8461, 8581, 8629, 9421, 9901, 10069
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Discriminant=-3360. See A139827 for more information.
Also primes of the form 45x^2+30xy+61y^2. See A140633. - T. D. Noe (noe(AT)sspectra.com), May 19 2008
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FORMULA
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The primes are congruent to {61, 181, 229, 349, 661, 829} (mod 840).
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MATHEMATICA
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QuadPrimes[21, 0, 40, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A007488 A142538 A057216 this_sequence A088955 A087870 A121513
Adjacent sequences: A139990 A139991 A139992 this_sequence A139994 A139995 A139996
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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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