fai'e'au PA5 experimental cmavo

digit/number: first Feigenbaum constant δ = 4.669 201 609 102 990 671 853 203 821 578(...).

See also: fai'e'ai

In notes:

fai'e'ai
digit/number: the second Feigenbaum constant α = 2.502907875095892822283902873218...