A136759 - OEIS

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A136759

a(n) = leading digit of n! in base 8.

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

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

OFFSET

0,3

LINKS

Robert Israel, Table of n, a(n) for n = 0..10000

MAPLE

f:= proc(n) local v; v:= n!; floor(v/8^floor(ilog2(v)/3)) end proc:

map(f, [$1..100]); # Robert Israel, Jun 07 2018

MATHEMATICA

Array[IntegerDigits[#!, 8][[1]]&, 100, 0] (* Vincenzo Librandi, Jun 07 2018 *)

PROG

(PARI) a(n) = digits(n!, 8)[1]; \\ Michel Marcus, Jan 27 2015