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A004219 10*log_10 (n) rounded down. 2
0, 3, 4, 6, 6, 7, 8, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = floor(10log_10(n)) = floor(10(log(n)/log(10))) =

floor(10(log(n)/(log(2) + log(5)))). - Alonso del Arte, Dec 24 2013

EXAMPLE

a(2) = 3 because 10(log(2)/log(10)) = 3.0102999566398...

a(3) = 4 because 10(log(3)/log(10)) = 4.77121254719662...

a(4) = 6 because 10(log(4)/log(10)) = 6.02059991327962...

MATHEMATICA

Table[Floor[10Log[10, n]], {n, 75}] (* Alonso del Arte, Dec 24 2013 *)

CROSSREFS

Cf. A004234.

Sequence in context: A160095 A135319 A329193 * A077542 A325611 A263842

Adjacent sequences:  A004216 A004217 A004218 * A004220 A004221 A004222

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms Alonso del Arte, Dec 24 2013

STATUS

approved

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Last modified September 23 03:31 EDT 2020. Contains 337291 sequences. (Running on oeis4.)