The Porter constant is 


                     /                       Zeta(1, 2)    
               ln(2) |3 ln(2) + 4 gamma - 24 ---------- - 2|
                     |                             2       |
                                                Pi        /
             6 --------------------------------------------- - 1/2
                                      2
                                    Pi

and evaluated at 256 digits is

1.4670780794339754728977984847072299534499033224148877773996858176166067443290
448084303693275111740152126648467904537951211083438009639129899655618987680453
893731001754921292557902445495488915098250648365657703396447482888189781231024
59699275573160698353198


































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