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楼主 |
发表于 2021-10-4 15:52
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我们现在看10012的双筛法下限值:
Pr<10012^1/2,r=24,{3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97}
a1=[(10012/2)*(1-2/3)]=1668
a2=[1668*(1-2/5)]=1000
a3=[1000*(1-2/7)]=714
a4=[714*(1-2/11)]=584
a5=[584*(1-2/13)]=494
a6=[494*(1-2/17)]=435
a7=[435*(1-2/19)]=389
a8=[389*(1-2/23)]=355
a9=[355*(1-2/29)]=330
a10=[330*(1-2/31)]=308
a11=[308*(1-2/37)]=291
a12=[291*(1-2/41)]=276
a13=[276*(1-2/43)]=263
a14=[263*(1-2/47)]=251
a15=[251*(1-2/53)]=241
a16=[241*(1-2/59)]=232
a17=[232*(1-2/61)]=224
a18=[224*(1-2/67)]=217
a19=[217*(1-2/71)]=210
a20=[210*(1-2/73)]=204
a21=[204*(1-2/79)]=198
a22=[198*(1-2/83)]=193
a23=[193*(1-2/89)]=188
a24=[188*(1-2/97)]=184
实际上r2(10012)=198
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