This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A102274 #11 Mar 14 2024 03:57:07
%S A102274 47,59,83,131,167,227,251,311,383,419,467,479,503,563,587,647,719,839,
%T A102274 887,971,983,1091,1151,1223,1259,1307,1319,1427,1487,1511,1559,1571,
%U A102274 1811,1823,1847,1907,1931,1979,2063,2099,2243,2267,2351,2399,2411,2579,2663,2687,2819,2903,2939,2999
%N A102274 Primes p such that Q(sqrt(-21p)) has genus characters chi_{-3} = -1, chi_{-7} = -1.
%C A102274 Primes p such that p is 3 (mod 4) and (-3/p) = (-7/p) = -1, where (k/n) is the Kronecker symbol. - _Robin Visser_, Mar 13 2024
%H A102274 H. Cohn and J. C. Lagarias, <a href="http://doi.org/10.1090/S0025-5718-1983-0717716-8">On the existence of fields governing the 2-invariants of the classgroup of Q(sqrt{dp}) as p varies</a>, Math. Comp. 41 (1983), 711-730.
%F A102274 The primes are congruent to {47, 59, 83} (mod 84). - _Robin Visser_, Mar 13 2024
%o A102274 (Magma) [p : p in PrimesUpTo(3000) | p mod 84 in [47, 59, 83]]; // _Robin Visser_, Mar 13 2024
%Y A102274 Cf. A102269, A102270, A102271, A102272, A102273, A102275.
%K A102274 nonn
%O A102274 1,1
%A A102274 _N. J. A. Sloane_ Feb 19 2005
%E A102274 More terms from _Robin Visser_, Mar 13 2024