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RTY@       @pþÝn¾aì@pbÉibnn¾a

8()        6( ) 4( )                          2 ()
                                           k ()
4()        3( )    k + 1, 2k + 1, 13
                                            −4 ( )
                          −3 ( )                     ()

                   32 −8

50 ( )     48 ( )             40 ( )       32 ( )

                                        [Mathcounts 1992] ( )

                              . 45

5 ( ) 4 ( ) 3 ( ) 2 ()

                   k − 1, 2k, 21 − k                     ()

                                        k

20 ( )     22 ( )             2( )         −2 ()

3          5                  5              3

13 ( )             8, 4, 2, 1, …, 1               (      )
24 ( )                             256       8 ()        )
                                                         )
           12 ( )             11 ( )

                 6, 6 2, 12, …, 3072               (

           19 ( )             15 ( )       10 ( )

                                           [MAΘ 2011] (

        .          cba        an = an2 + bn + c

        a3 = 1 a2 = 3 a1 = 1
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