%I #4 Mar 30 2012 16:49:31
%S 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,3,1,1,1,1,1,1,1,1,1,
%T 1,1,1,5,1,1,1,1,1,1,1,1,1,1,1,7,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,
%U 1,1,1,1,1,1,1,1,1,1,1,1
%N Class number h(p) of real quadratic field Q(sqrt(p)) where p is n-th prime == 1 mod 4.
%D H. Williams and H. te Riele, New computations concerning the Cohen-Lenstar heuristics, Experiment. Math. 12 (2003), no. 1, 99-113.
%e h(p) = 1 for p < 229, h(229) = h(257) = h(733) = h(761) = 3, h(401)=5 and h(577)=7, ...
%Y Cf. A002144, A076499.
%K nonn
%O 1,22
%A _N. J. A. Sloane_, Nov 11 2002