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 A379881 #49 Mar 12 2025 04:08:35
%S A379881 59,227,251,419,443,683,827,1187,1451,1523,1811,2027,2243,2339,2579,
%T A379881 2699,3299,3371,3467,3539,3659,3779,4211,4259,4523,4547,4691,5387,
%U A379881 5531,5651,6131,6203,6299,6323,6947,6971,7043,7187,7451,7499,7643,8123,8219,8363,8387,8867,8963,9011,9371,9491,9539,9851,9923
%N A379881 Prime numbers of the form 8*x^2 + 27*y^2 where x and y are positive integers.
%C A379881 All terms are congruent to 11 modulo 24.
%e A379881 59 = 8 * 2^2 + 27 * 1^2
%e A379881 227 = 8 * 5^2 + 27 * 1^2
%e A379881 251 = 8 * 1^2 + 27 * 3^2
%t A379881 With[{limit = 10000}, Sort[DeleteDuplicates[Select[Flatten[Table[8 x^2 + 27 y^2, {x, Floor[Sqrt[limit/8]]}, {y, Floor[Sqrt[limit/27]]}]], PrimeQ[#] && # < limit &]]]]
%Y A379881 Intersection of A107161 and A002145.
%K A379881 nonn,easy
%O A379881 1,1
%A A379881 _Steven Lu_, Feb 16 2025