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: 0

Author

Carmine Suriano, Feb 14 2011

Keywords

• nonn
• base

Comments

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

Examples

			a(10) = 1 since A000213(10) = 193.
		

Links

• Index entries for sequences related to Benford's law

Crossrefs

Cf. A000030, A000213.

Programs

Mathematica

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

Extensions

Offset changed by Georg Fischer, Jun 26 2024