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A033221
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Primes of form x^2+31*y^2.
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4
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31, 47, 67, 131, 149, 173, 227, 283, 293, 349, 379, 431, 521, 577, 607, 617, 653, 811, 839, 853, 857, 919, 937, 971, 1031, 1063, 1117, 1187, 1213, 1237, 1259, 1303, 1327, 1451, 1493, 1523, 1559, 1583, 1619
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OFFSET
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1,1
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COMMENTS
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Also primes of the form x^2-xy+8y^2 with x and y nonnegative. - T. D. Noe, May 07 2005
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REFERENCES
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D. Cox, "Primes of Form x^2 + n y^2", Wiley, 1989.
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..2000
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MATHEMATICA
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QuadPrimes[1, 0, 31, 10000] (* see A106856 *)
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CROSSREFS
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Sequence in context: A095318 A130096 A075586 * A127576 A139896 A004224
Adjacent sequences: A033218 A033219 A033220 * A033222 A033223 A033224
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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