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A033201
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Primes of the form x^2 + 10*y^2.
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9
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11, 19, 41, 59, 89, 131, 139, 179, 211, 241, 251, 281, 331, 379, 401, 409, 419, 449, 491, 499, 521, 569, 571, 601, 619, 641, 659, 691, 739, 761, 769, 809, 811, 859, 881, 929, 971, 1009, 1019, 1049, 1051, 1091, 1129, 1171, 1201, 1249, 1259, 1289, 1291, 1321, 1361, 1409, 1451, 1459, 1481
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OFFSET
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1,1
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REFERENCES
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David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989, p. 36.
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LINKS
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FORMULA
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Same as primes congruent to 1, 9, 11, or 19 mod 40. See, e.g., Cox, p. 36.
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MATHEMATICA
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Clear[f, lst, p, x, y]; f[x_, y_]:=x^2+10*y^2; lst={}; Do[Do[p=f[x, y]; If[PrimeQ[p]&&p<7212, AppendTo[lst, p]], {y, 0, 6!}], {x, 0, 6!}]; Take[Union[lst], 222] (* Vladimir Joseph Stephan Orlovsky, Aug 04 2009 *)
QuadPrimes2[1, 0, 10, 10000] (* see A106856 *)
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PROG
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(Magma) [p: p in PrimesUpTo(1500) | NormEquation(10, p) eq true]; // Bruno Berselli, Jul 03 2016
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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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