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发表于 2021-5-23 13:33
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最后我们定义D(x)≈ck*(x/(lnx)^2)*∏[p∣x][p≤√x]p-1/p-2
这时当x趋向无穷时,ck一定是一个不为0的常数。
根据素数定理,π(x)=x/lnx,如果按照(x/lnx)/lnx=x/(lnx)^2,对于2n中p+(2n-p)的素数对,其中1/2是重复的,所以D(2n)应为0.5*2n/(lnx)^2,但是在第2次筛法中,p+(2n-p)中都是奇数不存在被素数2整除的自然数,所以应当(0.5+a)*2n/(lnx)^2.
我们有
q1=3
【∑[k=1,1.q≠q+2]qk】=3
4*3^2=36
(ln36)^2=12.8416079826
36/3=12
12.8416079826/12=1.0701339985
c1=1.0701339985
q2=5
【∑[k=1,2.q≠q+2]qk】=8
4*5^2=100
(ln100)^2=21.2075924420
100/8=12.5
12.5/21.2075924420/12.5=1.6966073952
c2=1.6966073952
q3=11
【∑[k=1,3.q≠q+2]qk】=19
4*11^2=484
(ln484)^2=38.2181737936
484/19=25.4736842105
38.2181737936/25.4736842105=1.5003002109
c3=1.5003002109
q4=17
【∑[k=1,4.q≠q+2]qk】=36
4*17^2=1156
(ln1156)^2=49.7408741978
1156/36=32.1111111111
49.7408741978/32.1111111111=1.5490237638
c4=1.5490237638
q5=29
【∑[k=1,5.q≠q+2]qk】=65
4*29^2=3364
(ln3364)^2=65.9487897677
3364/65=51.7538461538
65.9487897677/51.7538461538=1.2742780426
c5=1.2742780426
q6=41
【∑[k=1,6.q≠q+2]qk】=106
4*41^2=6724
(ln6724)^2=77.6766980963
6724/106=63.4339622642
77.6766980963/63.4339622642=1.2245285541
c6=1.2245285541
q7=59
【∑[k=1,7.q≠q+2]qk】=165
4*59^2=13924
(ln13924)^2=91.0377271439
13924/165=84.3878787879
91.0377271439/84.3878787879=1.0788009896
c7=1.0788009896
q8=71
【∑[k=1,8.q≠q+2]qk】=236
4*71^2=20164
(ln20164)^2=98.2408872994
20164/236=85.4406779661
98.2408872994/85.4406779661=1.1498139953
c8=1.1498139953
q9=101
【∑[k=1,9.q≠q+2]qk】=337
4*101^2=40804
(ln40804)^2=112.7108237890
40804/337=121.0801186944
112.7108237890/121.0801186944=0.9308780418
c9=0.9308780418
q10=107
【∑[k=1,10.q≠q+2]qk】=444
4*107^2=45796
(ln45796)^2=115.1747943742
45796/444=103.1441441441
115.1747943742/103.1441441441=1.1166391979
c10=1.1166391979
【】【】【】【】【】【】【】【】
q100=3821
【∑[k=1,100.q≠q+2]qk】=163992
4*3821^2=58400164
(ln58400164)^2=319.7955821992
58400164/163992=356.1159324845
319.7955821992/356.1159324845=0.8980097576
c100=0.8980097576
q1000=79559
【∑[k=1,1000.q≠q+2]qk】=34354616
4*79559^2=25318537924
(ln25318537924)^2=573.8325718498
25318537924/34354616=736.9763039703
573.8325718498/736.9763039703=0.7786309665
c1000=0.7786309665
q10000=1260989
【∑[k=1,10000.q≠q+2]qk】=5778153630
4*1260989^2=6360373032484
(ln6360373032484)^2=869.13573742575
6360373032484/5778153630=1100.7621880216432
869.13573742575/1100.7621880216432=0.78957630166041
c10000=0.78957630166041
q20000=2840417
【∑[k=1,20000.q≠q+2]qk】=26094675212
4*2840417^2=32271874935556
(ln32271874935556)^2=967.5345384154
32271874935556/26094675212=1236.7226138425
967.5345384154/1236.7226138425=0.7823375489
C20000=0.7823375489
q30000=4553411
【∑[k=1,30000.q≠q+2]qk】=62962539862
4*4553411^2=82934206939684
(ln82934206939684)^2=1027.1428059411
82934206939684/62962539862=1317.1991968789
1027.1428059411/1317.1991968789=0.7797930703
C30000=0.7797930703
q40000=6381467
【∑[k=1,40000.q≠q+2]qk】=117627491884
4*6381467^2=162892484288356
(ln162892484288356)^2=1070.8674730390
162892484288356/117627491884=1384.8164377167
1070.8674730390/1384.8164377167=0.7732920002
C40000=0.7732920002
q50000=8264957
【∑[k=1,50000.q≠q+2]qk】=190879246815
4*8264957^2=273238056847396
(ln273238056847396)^2=1104.9883160956
273238056847396/190879246815=1431.4707408303
1104.9883160956/1431.4707408303=0.7719251848
C50000=0.7719251848
q60000=10196441
【∑[k=1,60000.q≠q+2]qk】=283129259045
4*10196441^2=415869636265924
(ln415869636265924)^2=1133.0893755161
415869636265924/283129259045=1468.8331317952
1133.0893755161/1468.8331317952=0.7714214440
C60000=0.7714214440
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