A186192 - OEIS

A186192

First digit of pentanacci numbers A000322.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

COMMENTS

Sequence obeys Benford law about distribution of first digits in a sequence P(n)=Log(1+1/n).

LINKS

Indranil Ghosh, Table of n, a(n) for n = 1..10000

Index entries for sequences related to Benford's law

EXAMPLE

a(15)=1 since Penta(15)=1921.

MATHEMATICA

t = {1, 1, 1, 1, 1}; Do[AppendTo[t, t[[-1]] + t[[-2]] + t[[-3]] + t[[-4]] + t[[-5]]], {100}]; Table[IntegerDigits[i][[1]], {i, t}]