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%I #5 Nov 30 2016 05:10:40
%S 20,21,24,32,48,64,72,96,100,144,147,199,288,576
%N Numbers n such that the Shimura subgroup Sigma(n) of the Jacobi variety J_0(n) has order 2.
%D Ling, S., and J. Oesterlé. "The Shimura subgroup of J_0(N)." Astérisque, Vol. 196-197 (1991), 171-203.
%Y Cf. A278581.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Nov 30 2016
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