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发表于 2020-2-9 16:08
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2020-02-08作为非常特殊的一个元宵节让人难忘。
以20200208000为随机偶数的起点,使用素数连乘式计算一组连续偶数的素对下界值,看看与真值的贴近程度:
G(20200208000) = 43845338;
inf( 20200208000 )≈ 43827264.6 , Δ≈-0.0004122,infS(m) = 25874203.98 , k(m)= 1.69386
G(20200208002) = 28293784;
inf( 20200208002 )≈ 28275766.7 , Δ≈-0.0006368,infS(m) = 25874203.99 , k(m)= 1.09282
G(20200208004) = 51780662;
inf( 20200208004 )≈ 51748408 , Δ≈-0.0006229,infS(m) = 25874203.99 , k(m)= 2
G(20200208006) = 28781135;
inf( 20200208006 )≈ 28768475.2 , Δ≈-0.0004399,infS(m) = 25874203.99 , k(m)= 1.11186
G(20200208008) = 25894836;
inf( 20200208008 )≈ 25874204 , Δ≈-0.0007968,infS(m) = 25874203.99 , k(m)= 1
G(20200208010) = 73697337;
inf( 20200208010 )≈ 73656071.6 , Δ≈-0.0005599,infS(m) = 25874204 , k(m)= 2.8467
G(20200208012) = 26654801;
inf( 20200208012 )≈ 26643950 , Δ≈-0.0004071,infS(m) = 25874204 , k(m)= 1.02975
G(20200208014) = 31550696;
inf( 20200208014 )≈ 31526722.4 , Δ≈-0.0007598,infS(m) = 25874204 , k(m)= 1.21846
G(20200208016) = 53264022;
inf( 20200208016 )≈ 53226934 , Δ≈-0.0006963,infS(m) = 25874204 , k(m)= 2.05714
G(20200208018) = 25899592;
inf( 20200208018 )≈ 25884918 , Δ≈-0.0005666,infS(m) = 25874204.01 , k(m)= 1.00041
G(20200208020) = 35283169;
inf( 20200208020 )≈ 35265581.8 , Δ≈-0.0004985,infS(m) = 25874204.01 , k(m)= 1.36296
G(20200208022) = 54272875;
inf( 20200208022 )≈ 54240916.6 , Δ≈-0.0005888,infS(m) = 25874204.01 , k(m)= 2.09633
time start =15:07:26 ,time end =15:11:40 ,time use =
计算式:
inf( 20200208000 ) = 1/(1+ .1535 )*( 20200208000 /2 -2)*p(m) ≈ 43827264.6
inf( 20200208002 ) = 1/(1+ .1535 )*( 20200208002 /2 -2)*p(m) ≈ 28275766.7
inf( 20200208004 ) = 1/(1+ .1535 )*( 20200208004 /2 -2)*p(m) ≈ 51748408
inf( 20200208006 ) = 1/(1+ .1535 )*( 20200208006 /2 -2)*p(m) ≈ 28768475.2
inf( 20200208008 ) = 1/(1+ .1535 )*( 20200208008 /2 -2)*p(m) ≈ 25874204
inf( 20200208010 ) = 1/(1+ .1535 )*( 20200208010 /2 -2)*p(m) ≈ 73656071.6
inf( 20200208012 ) = 1/(1+ .1535 )*( 20200208012 /2 -2)*p(m) ≈ 26643950
inf( 20200208014 ) = 1/(1+ .1535 )*( 20200208014 /2 -2)*p(m) ≈ 31526722.4
inf( 20200208016 ) = 1/(1+ .1535 )*( 20200208016 /2 -2)*p(m) ≈ 53226934
inf( 20200208018 ) = 1/(1+ .1535 )*( 20200208018 /2 -2)*p(m) ≈ 25884918
inf( 20200208020 ) = 1/(1+ .1535 )*( 20200208020 /2 -2)*p(m) ≈ 35265581.8
inf( 20200208022 ) = 1/(1+ .1535 )*( 20200208022 /2 -2)*p(m) ≈ 54240916.6
计算式中:
p(m)=0.5π(1- 2/r )* π[(p1-1)/(p1- 2)],
其中,波动系数k(m)=π[(p1-1)/(p1- 2)],p1系偶数M含有的奇素因子,p1<√(M-2);
当然,素数连乘式计算偶数的素对数量,并不是唯一的好方法,同样使用类似哈-李素对计算式的方法也能比较高精度的计算偶数M的素对数量:
计算式:
Xi(M)=t1*c1*M/(logM)^2 ;
( 式中:t1=1.358-log(M)^(2.045/3)*.03178 ,c1- 只计算到√M的拉曼扭扬系数)
G(20200208000) = 43845338 ;Xi(M)≈ 43439112.44 δxi( 20200208000 )≈-0.009265
G(20200208002) = 28293784 ;Xi(M)≈ 28025345.57 δxi( 20200208002 )≈-0.009488
G(20200208004) = 51780662 ;Xi(M)≈ 51290105.41 δxi( 20200208004 )≈-0.009474
G(20200208006) = 28781135 ;Xi(M)≈ 28513691.17 δxi( 20200208006 )≈-0.009292
G(20200208008) = 25894836 ;Xi(M)≈ 25645052.71 δxi( 20200208008 )≈-0.009646
G(20200208010) = 73697337 ;Xi(M)≈ 73003745.75 δxi( 20200208010 )≈-0.009411
G(20200208012) = 26654801 ;Xi(M)≈ 26407981.85 δxi( 20200208012 )≈-0.009260
G(20200208014) = 31550696 ;Xi(M)≈ 31247509.58 δxi( 20200208014 )≈-0.009610
G(20200208016) = 53264022 ;Xi(M)≈ 52755535.84 δxi( 20200208016 )≈-0.009547
G(20200208018) = 25899592 ;Xi(M)≈ 25655671.25 δxi( 20200208018 )≈-0.009418
time start =16:00:47 end time =16:03:12 |
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