還有一個三項的拆分:1/2M + 1/(2M+1)+1/[(2M+1)*2M],
n 小於2^M-1。
M=3時,1/3 + (1/4+1/12)+(1/6+1/7+1/42),不用2^3-1=7
M=6時,1/6 + (1/7+1/42)+(1/8+1/24)+(1/9+1/18)+(1/12+1/13+1/156)+
(1/10+1/90+1/19+1/342)共14項,不用2^6-1=63
還有一個三項的拆分:1/2M + 1/(2M+1)+1/[(2M+1)*2M],
n 小於2^M-1。
M=3時,1/3 + (1/4+1/12)+(1/6+1/7+1/42),不用2^3-1=7
M=6時,1/6 + (1/7+1/42)+(1/8+1/24)+(1/9+1/18)+(1/12+1/13+1/156)+
(1/10+1/90+1/19+1/342)共14項,不用2^6-1=63
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