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A300659 Product of digits of n!. 0
1, 1, 2, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Also multiplicative digital root of n!.

a(n) = 0 for n >= 5.

Decimal expansion of 2817/2500. - Eric Chen, Jun 06 2018

LINKS

Table of n, a(n) for n=0..86.

FORMULA

a(n) = A031347(A000142(n)).

a(n) = A007954(A000142(n)). - Eric Chen, Jun 06 2018

MATHEMATICA

Array[Times @@ IntegerDigits[#!] &, 105] (* Michael De Vlieger, Jun 06 2018 *)

PROG

(MAGMA) [&*Intseq(Factorial(n)): n in [0..100]]

(PARI) a(n) = my(d=digits(n!)); prod(k=1, #d, d[k]); \\ Michel Marcus, Jun 05 2018

CROSSREFS

Cf. A000142, A007954, A031347, A067067, A086358, A004152.

Sequence in context: A250547 A057249 A246120 * A155003 A327279 A021377

Adjacent sequences:  A300656 A300657 A300658 * A300660 A300661 A300662

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Jun 05 2018

STATUS

approved

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Last modified March 8 00:38 EST 2021. Contains 341934 sequences. (Running on oeis4.)