%I #6 Oct 13 2017 05:32:03

%S 5,41,113,3089,12641,50753,675569,1410977

%N Smallest prime for which 2^n exactly divides the class number h(8p) and X^2 - 2pY^2 = -1 is solvable.

%H 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 nonn,more

%O 1,1

%A _N. J. A. Sloane_, Feb 19 2005