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A369863
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Inert rational primes in the field Q(sqrt(-21)).
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0
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13, 29, 43, 47, 53, 59, 61, 67, 73, 79, 83, 97, 113, 127, 131, 137, 149, 151, 157, 163, 167, 181, 197, 211, 227, 229, 233, 241, 251, 281, 311, 313, 317, 331, 349, 379, 383, 389, 397, 401, 409, 419, 433, 449, 463, 467, 479, 487, 499, 503, 547, 557, 563, 569, 571, 577, 587
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OFFSET
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1,1
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COMMENTS
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Primes p such that Legendre(-21,p) = -1.
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LINKS
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MATHEMATICA
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Select[Range[3, 600], PrimeQ[#] && JacobiSymbol[-21, #]==-1 &] (* Stefano Spezia, Feb 04 2024 *)
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PROG
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(SageMath) [p for p in prime_range(3, 600) if legendre_symbol(-21, p) == -1]
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CROSSREFS
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Cf. inert rational primes in the imaginary quadratic field Q(sqrt(-d)) for the first squarefree positive integers d: A002145 (1), A003628 (2), A003627 (3), A003626 (5), A191059 (6), A003625 (7), A296925 (10), A191060 (11), A105885 (13), A191061 (14), A191062 (15), A296930 (17), A191063 (19), this sequence (21), A191064 (22), A191065 (23).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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