마이셀-메르텐스 상수: 두 판 사이의 차이
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:<math>B_2= \left(\sum_{n=1}^{\infty} \left(ln \left( 1-{{1}\over{p_n}} \right) + {{1}\over{p_n -1}} \right) \right) +\gamma</math>
:<math>B_2= \left(\sum_{x=2}^{\infty} {{\phi(x) ln(\zeta(x))}\over{x}} \right) +\gamma</math>
:<math>=1.034653...</math> {{OEIS|A083342}} <ref>Decimal expansion of average deviation of the total number of prime factors or decimal expansion of constant B2 from the summatory function of the restricted divisor function. (REFERENCES) S. R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, pp. 94-98 J. Sandor, B. Crstici, Handbook of Number Theory II, p 155, Chapter V, 1) b)</ref>
:<math>\phi </math>는 [[오일러 피 함수]] <math>, \zeta</math> 는 [[리만 제타 함수]] <math>, \gamma</math> [[오일러-마스케로니 상수]]
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