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 A186190 First digit of tribonacci sequence A000213. 2

%I

%S 1,1,1,3,5,9,1,3,5,1,1,3,6,1,2,4,7,1,2,4,8,1,2,5,9,1,3,6,1,2,3,6,1,2,

%T 4,7,1,2,4,9,1,3,5,1,1,3,6,1,2,4,7,1,2,4,8,1,2,5,9,1,3,6,1,2,3,6,1,2,

%U 4,7,1,2,4,9,1,3,5,1,1,3,6,1,2,4,7,1,2,4,8,1,2,5,9,1,3,6,1,2,3,6,1,2,4

%N First digit of tribonacci sequence A000213.

%C Sequence obeys the Benford law about distribution of first digit d in a sequence: P(d) = log_10(1+1/d).

%H <a href="/index/Be#Benford">Index entries for sequences related to Benford's law</a>

%e a(10) = 1 since Trib(10) = 105.

%t t = {1,1,1}; Do[AppendTo[t, t[[-1]] + t[[-2]] + t[[-3]]], {100}]; Table[IntegerDigits[i][[1]], {i, t}]

%Y Cf. A000213.

%K nonn,base

%O 1,4

%A _Carmine Suriano_, Feb 14 2011

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Last modified May 13 23:41 EDT 2021. Contains 343868 sequences. (Running on oeis4.)