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每兩項之間的的差為公差為1的等差數列 例如3-1=2 6-3=3 10-6=4 15-10=5 21-15=6 28-21=7可以推算28的下一項為36 同時也可以看到的是1+3=4=2*2 6+10=16=4*4 21+15=36=6*6 28+36=64=8*8
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