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

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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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170000 digits of gamma, as calculated from a value furnished by Jon Borwein. gamma or Euler constant is Lim(n->infinity) {sum(1/k,k=1..n) - log(n)}