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A107193
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Primes of the form x^2 + 81y^2.
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2
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97, 181, 277, 337, 349, 373, 613, 733, 757, 829, 853, 1129, 1213, 1237, 1297, 1321, 1549, 1657, 1693, 1753, 2017, 2029, 2089, 2137, 2221, 2281, 2521, 2917, 3037, 3049, 3181, 3217, 3229, 3433, 3469, 3541, 3697, 3877, 4093, 4177, 4549, 4597
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OFFSET
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1,1
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COMMENTS
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Discriminant = -324. See A107132 for more information.
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LINKS
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MATHEMATICA
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QuadPrimes2[1, 0, 81, 10000] (* see A106856 *)
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PROG
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(PARI) list(lim)=my(v=List(), w, t); for(x=1, sqrtint(lim\1), w=x^2; for(y=1, sqrtint((lim-w)\81), if(isprime(t=w+81*y^2), listput(v, t)))); Set(v) \\ Charles R Greathouse IV, Feb 10 2017
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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