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- $x^3 - x^2 - x - 1 = 0$
Its decimal expansion starts:
- $\eta = 1 \cdotp 83928 \, 67552 \, 1416 \ldots$
Also known as
Some sources leave its first letter in lowercase: tribonacci constant.
Hence it is pronounced trib-bo-nat-chi, or trib-bo-nar-chi, according to taste.
The word arises as a direct analogy with the Fibonacci numbers.
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1 \cdotp 83928 \, 67552 \, 1416 \ldots$