One-ninth constant is 0.1076539192264845766153234450909471905879765038
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0.4749493799879206503325046363279829685595493732172029822833310248 6455792917488386027427564125050214441890378494262395464775250455 2099778523950882780814821592082565202912193041770281959987798787 6404342380353179170625016170252803841553681975679189489592083858
to 256 digits is also this closed expression.
2**(5/4)*sqrt(Pi)*exp(Pi/8)*GAMMA(1/4)**(-2);
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-Zeta(1,1/2).
is also equal to -Zeta(1/2)*(1/2*gamma+1/2*ln(8*Pi)+1/4*Pi).
3.922646139209151727471531446714599513730323971506505209568298485 2547208031503382848806505231041456914038034379886764996843321856 0187370796648866325531877003002927708284792679262934379740474743 4560678349258709176744625306684542186046544092107149397014020908
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