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A186191 First digit of tetranacci numbers A000288. 1
1, 1, 1, 1, 4, 7, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 5, 1, 2, 4, 8, 1, 3, 5, 1, 2, 4, 8, 1, 3, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

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

LINKS

Table of n, a(n) for n=1..104.

Index entries for sequences related to Benford's law

EXAMPLE

a(10)=9 since Tetra(10)=94.

MATHEMATICA

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

CROSSREFS

Cf. A000288.

Sequence in context: A188735 A254338 A197723 * A256507 A123734 A011519

Adjacent sequences:  A186188 A186189 A186190 * A186192 A186193 A186194

KEYWORD

nonn,base

AUTHOR

Carmine Suriano, Feb 14 2011

STATUS

approved

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Last modified May 9 15:34 EDT 2021. Contains 343742 sequences. (Running on oeis4.)