Feigenbaum

Feigenbaum reduction parameter
2.502907875095892822283902873218215786381271376727149977336192056

Feigenbaum bifurcation velocity constant
4.669201609102990671853203820466201617258185577475768632745651343 00413433021131473

References :
Briggs, Keith
A precise calculation of the Feigenbaum constants. (English)
Math. Comp. 57 (1991), no. 195, 435--439.

Briggs, Keith How to calculate the Feigenbaum constants on your PC.
Austral. Math. Soc. Gaz. 16 (1989), no. 4, 89--92.58F14