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 A102265 #6 Oct 13 2017 05:32:03
%S A102265 5,41,113,3089,12641,50753,675569,1410977
%N A102265 Smallest prime for which 2^n exactly divides the class number h(8p) and X^2 - 2pY^2 = -1 is solvable.
%H A102265 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.
%K A102265 nonn,more
%O A102265 1,1
%A A102265 _N. J. A. Sloane_, Feb 19 2005