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A033215
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Primes of form x^2+21*y^2.
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27
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37, 109, 193, 277, 337, 373, 421, 457, 541, 613, 673, 709, 757, 877, 1009, 1033, 1093, 1117, 1129, 1201, 1213, 1297, 1381, 1429, 1453, 1549, 1597, 1621, 1789, 1801, 1873, 1933, 2017, 2053, 2137, 2221
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OFFSET
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1,1
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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..1000
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FORMULA
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The primes are congruent to {1, 25, 37} (mod 84). - T. D. Noe, Apr 29 2008
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MATHEMATICA
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QuadPrimes[1, 0, 21, 10000] (* see A106856 *)
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CROSSREFS
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Cf. A139643.
Sequence in context: A139934 A142051 A171833 * A195316 A031419 A176549
Adjacent sequences: A033212 A033213 A033214 * A033216 A033217 A033218
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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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