A186190 First digit of tribonacci sequence A000213.

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, 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, 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

Offset

1,4

Comments

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

Links

Table of n, a(n) for n=1..103.

Index entries for sequences related to Benford's law

Example

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

Mathematica

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

Crossrefs

Cf. A000213.

Sequence in context: A058642 A258086 A141251 * A019739 A101298 A296452

Adjacent sequences: A186187 A186188 A186189 * A186191 A186192 A186193

Keyword

nonn,base

Author

Carmine Suriano, Feb 14 2011

Status

approved