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A096233
Number of digits of the 10^n-th tribonacci number (A000073).
0
2, 26, 264, 2646, 26464, 264649, 2646494, 26464944, 264649443, 2646494434, 26464944348, 264649443484, 2646494434842, 26464944348425, 264649443484250, 2646494434842508, 26464944348425087
OFFSET
0,1
COMMENTS
a(n)/10^n tends towards log[10](rho) = .26464944348425087191..., where rho is the real root of x^3-x^2-x-1 = 0. - Vladeta Jovovic, Sep 01 2004
MATHEMATICA
rho=1/3*((19+3*Sqrt[33])^(1/3)+(19-3*Sqrt[33])^(1/3)+1); triboappr[n_]:=N[(rho-1)/(4rho-6)*rho^(n-3), 3000]; Table[MantissaExponent[triboappr[10^i]][[2]], {i, 1, 7}]
CROSSREFS
Cf. A068070.
Sequence in context: A289263 A296600 A187252 * A363985 A126673 A057351
KEYWORD
nonn,easy,base
AUTHOR
Michael Taktikos, Aug 09 2004
STATUS
approved