素数上下界估计之中值2

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素数上下界估计之中值2

x=2^11
(375.0477+287.7937)/2=331.4207
π(2^11)=309
331.4207/309=1.072559

x=2^12
(811.059+481.54196)/2=646.30
π(2^12)=564
646.30/564=1.1459

x=2^13
(1741.825+805.72526)/2=1273.775
π(2^13)=1028
1273.775/1028=1.23908

x=2^14
(3718.701+1348.1550)/2=2533.428
π(2^14)=1900
2533.428/1900=1.333383

x=2^15
(7898.939+2255.759)/2=5077.349
π(2^15)=3512
5077.349/3512=1.44571

x=2^16
(16704.13+3774.379)/2=10239.3
π(2^16)=6542
10239.3/6542=1.5652

x=2^17
(35187.74+6315.364)/2=20751.55
π(2^17)=12251
20751.55/12251=1.69387

x=2^18
(73869.60+10566.988)/2=42218.3
π(2^18)=23000
42218.3/23000=1.83558

x=2^19
(154600.1+17680.887)/2=86140.5
π(2^19)=43390
86140.5/43390=1.98526

x=2^20
(322672.00+29584.000)/2=176128.00
π(2^20)=82025
176 128.00/82025=2.147248