根据网页《Prime Constellation》(网址:https://mathworld.wolfram.com/PrimeConstellation.html)
孪生素数的数量积分公式是:
Px(p,p+2) ~2*∏p*(p-2)/(p-1)^2*∫dx’/[ln(x’)]^2 = 1.320323632…*∫dx’/[ln(x’)]^2
式中p≥3,积分下限是2,上限是x
孪生素数常数C=∏p*(p-2)/(p-1)^2
序号1 素数1 p*(p-2)/(p-1)^2 ∏p*(p-2)/(p-1)^2
1 2 0
2 3 0.75 0.75
3 5 0.9375 0.703125
4 7 0.972222222 0.68359375
5 11 0.99 0.676757813
6 13 0.993055556 0.672058105
7 17 0.99609375 0.669432878
8 19 0.99691358 0.667366728
9 23 0.997933884 0.665987871
10 29 0.99872449 0.665138396
……
49999 611951 1 0.660161891
50000 611953 1 0.660161891
……
当p继续增大到无穷大时,孪生素数常数c等于0.660161816…
前105位数字是6, 6, 0, 1, 6, 1, 8, 1, 5, 8, 4, 6, 8, 6, 9, 5, 7, 3, 9, 2, 7, 8, 1, 2, 1, 1, 0, 0, 1, 4, 5, 5, 5, 7, 7, 8, 4, 3, 2, 6, 2, 3, 3, 6, 0, 2, 8, 4, 7, 3, 3, 4, 1, 3, 3, 1, 9, 4, 4, 8, 4, 2, 3, 3, 3, 5, 4, 0, 5, 6, 4, 2, 3, 0, 4, 4, 9, 5, 2, 7, 7, 1, 4, 3, 7, 6, 0, 0, 3, 1, 4, 1, 3, 8, 3, 9, 8, 6, 7, 9, 1, 1, 7, 7, 9,……
(A005597共给出1001位数字)
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