The numerical values of Tribonacci numbers are c**n essentially and
the c here is one of the roots of (x^3-x^2-x-1), then there is another
constant c2. So the exact formula is c**n/c2.
Another way of doing 'exact formulas' are given by using [ ] function
the n'th term of the series expansion of 1/(1+x+x**2) is
1 - 2 floor(1/3 n + 2/3) + floor(1/3 n + 1/3) + floor(1/3 n)
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The twin primes constant.
0.660161815846869573927812110014555778432623
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The Varga constant, also known to be the 1/(one-ninth constant).
9.2890254919208189187554494359517450610317
One-ninth constant is 0.1076539192264845766153234450909471905879765038
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0.4749493799879206503325046363279829685595493732172029822833310248
6455792917488386027427564125050214441890378494262395464775250455
2099778523950882780814821592082565202912193041770281959987798787
6404342380353179170625016170252803841553681975679189489592083858
to 256 digits is also this closed expression.
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