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A186192 First digit of pentanacci numbers A000322. 2
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}]

First[IntegerDigits[#]]&/@LinearRecurrence[{1, 1, 1, 1, 1}, {1, 1, 1, 1, 1}, 110] (* Harvey P. Dale, Mar 28 2013 *)

CROSSREFS

Cf. A000322.

Sequence in context: A188616 A274418 A127414 * A231532 A086201 A010490

Adjacent sequences:  A186189 A186190 A186191 * A186193 A186194 A186195

KEYWORD

nonn,base

AUTHOR

Carmine Suriano, Feb 14 2011

STATUS

approved

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Last modified April 13 01:36 EDT 2021. Contains 342934 sequences. (Running on oeis4.)