n=8,12,16,24,36,48,60,72的a(n)非平凡因子分解:
(2*4) (2*6) (2*8) (3*8) (4*9) (6*8) (2*30) (8*9)
(3*4)(4*4)(4*6)(6*6)(2*24)(3*20)(2*36)
(2*2*4) (2*12) (2*18) (3*16) (4*15) (3*24)
(2*2*6) (3*12) (4*12) (5*12) (4*18)
(2*3*4) (2*2*9) (2*3*8) (6*10) (6*12)
(2*3*6) (2*4*6) (2*5*6) (2*4*9)
(3*3*4)(3*4*4)(3*4*5)(2*6*6)
(2*2*12) (2*2*15) (3*3*8)
(2*2*2*6) (2*3*10) (3*4*6)
(2*2*3*4) (2*2*18)
(2*3*12)
(2*2*2*9)
(2*2*3*6)
(2*3*3*4)
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