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A008905 Leading digit of n!. 19
1, 1, 2, 6, 2, 1, 7, 5, 4, 3, 3, 3, 4, 6, 8, 1, 2, 3, 6, 1, 2, 5, 1, 2, 6, 1, 4, 1, 3, 8, 2, 8, 2, 8, 2, 1, 3, 1, 5, 2, 8, 3, 1, 6, 2, 1, 5, 2, 1, 6, 3, 1, 8, 4, 2, 1, 7, 4, 2, 1, 8, 5, 3, 1, 1, 8, 5, 3, 2, 1, 1, 8, 6, 4, 3, 2, 1, 1, 1, 8, 7, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000 (terms 0..1000 from T. D. Noe)

Index entries for sequences related to factorial numbers

FORMULA

a(n) = A000030(A000142(n)). - Reinhard Zumkeller, Apr 08 2012

MATHEMATICA

f[n_] := Quotient[ n!, 10^Floor@ Log[10, n!]]; Array[ f, 105, 0]

PROG

(Haskell)

a008905 = a000030 . a000142  -- Reinhard Zumkeller, Apr 08 2012

CROSSREFS

Cf. A000966, A000142, A018799, A202021 (leading digit of (10^n)!).

Sequence in context: A082516 A318709 A204935 * A136760 A303335 A289382

Adjacent sequences:  A008902 A008903 A008904 * A008906 A008907 A008908

KEYWORD

nonn,base,easy

AUTHOR

Russ Cox

EXTENSIONS

Two less-efficient Mathematica codings removed by Robert G. Wilson v, Nov 05 2010

STATUS

approved

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Last modified November 16 12:40 EST 2018. Contains 317272 sequences. (Running on oeis4.)