3.15,16,13,19,11,22,( ),( ),7,( ),...

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3.15,16,13,19,11,22,(),(),7,(),...3.15,16,13,19,11,22,(),(),7,(),...3.15,16,13,19,11,22,(),(),7,(),.

3.15,16,13,19,11,22,( ),( ),7,( ),...
3.15,16,13,19,11,22,( ),( ),7,( ),...

3.15,16,13,19,11,22,( ),( ),7,( ),...
15,16,13,19,11,22,(9 ),( 25),7,(28 ),...
奇偶项分开看,奇数项每项比前一项小2,偶数项每项比前一项大3

15,16,13,19,11,22,(9 ),( 25),7,(28 ),...

9 25 28