## Porter's Constant

N.B. A detailed on-line essay by S. Finch was the starting point for this entry.

The constant appearing in Formulas for the efficiency of the Euclidean Algorithm,

where is the Euler-Mascheroni Constant and is the Riemann Zeta Function.

Finch, S. Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/porter/porter.html
Porter, J. W. On a Theorem of Heilbronn.'' Mathematika 22, 20-28, 1975.