381329938669733199458406232903960570319092726406838808560840747389568335052094
151491733048363304771434582553921221820451656004278
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Zeta(1,2) ot the derivative of Zeta function at 2.

-0.9375482543158437537025740945678649778978602886148299258854334803
6044381131270752279368941514115151749311382116241638535059404171
5961733247197185174912402688214443700163931015045107160373574873
1352956057133552593318050514872534799984717397570317550302619073
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Feigenbaum reduction parameter
2.502907875095892822283902873218215786381271376727149977336192056

Feigenbaum bifurcation velocity constant
4.669201609102990671853203820466201617258185577475768632745651343
00413433021131473
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Fransen-Robinson constant.

2.80777024202851936522150118655777293230808592093019829122005

ref :
Math of Computation, vol 34 1980 pp 553-566
Math of Computation vol 37 1981 pp 233-235
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The Gauss-Kuzmin-Wirsing constant.

0.303663002898732658597448121901
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Khinchin constant to 1024 digits.