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 A306969 #11 Mar 27 2019 03:46:57
%S A306969 2,22,46,58,85,93,102,205,298,310,330,358,466,478,697,862,949,1222,
%T A306969 1402,1513,1957,1978,2962,3502,7165,10558
%N A306969 Numbers congruent to 1, 2, or 4 mod 7 that are not represented by x^2+7*y^2+7*z^2.
%H A306969 Irving Kaplansky, <a href="https://doi.org/10.1090/S0025-5718-1995-1265017-2">The first nontrivial genus of positive definite ternary forms</a>, Mathematics of Computation, Vol. 64 (1995): 341-345.
%Y A306969 Cf. A047350 (numbers congruent to {1, 2, 4} mod 7).
%K A306969 nonn,more
%O A306969 1,1
%A A306969 _N. J. A. Sloane_, Mar 26 2019