104种24阶环 gap> NumberSmallRings(18); 0 gap> NumberSmallRings(24); 0 390种16阶环 gap> NumberSmallRings(16); 0//应该是390 16阶循环环共有T(16)=|{1,2,4,8,16}|=5种,特征都为16。 R16_1=Z/256Z_=M_16 R16_2=Z/32Z_ R16_3=Z/48Z_=Z/16Z=Z/16Z_ R16_4=Z/64Z_ R16_5=Z/128Z_ R16