The On-Line Encyclopedia of Integer Sequences (OEIS)

A060956 revision #16

A060956

Leading digit of 3^n.

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

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

OFFSET

0,2

LINKS

Harry J. Smith, Table of n, a(n) for n = 0..1000

Dmitry Kamenetsky, First digit of 3^2020, Puzzling StackExchange.

FORMULA

a(n) = [3^n / 10^([log_10(3^n) ]) ] = [3^n / 10^([n*log_10(3) ]) ].

a(n) = A000030(A000244(n)). - Michel Marcus, Jul 03 2018

MATHEMATICA

First[IntegerDigits[#]]&/@(3^Range[0, 110]) (* Harvey P. Dale, May 16 2016 *)

PROG

(PARI) { default(realprecision, 100); for (n=0, 1000, t=log(3)/log(10); write("b060956.txt", n, " ", 3^n \ 10^floor(n*t)); ) } \\ Harry J. Smith, Jul 15 2009

CROSSREFS

Cf. A000030, A000244.

Sequence in context: A008564 A348371 A354129 * A125301 A347214 A263559

Adjacent sequences: A060953 A060954 A060955 * A060957 A060958 A060959

KEYWORD

nonn,base,easy

AUTHOR

Ahmed Fares (ahmedfares(AT)my-deja.com), May 08 2001

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 11 2001

STATUS

proposed