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%I #8 Oct 13 2017 05:48:45
%S 16,8,8,8,16,16,8,32,16,16,16,8,16,8,64,8,8,8,8,128,16,8,8,32
%N 2-class number of Q(sqrt(-21p)) as p runs through primes in A102271.
%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.
%Y Cf. A102269, A102270, A102271, A102273, A102274, A102275.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Feb 19 2005
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