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A202708 Sum of digits of n! divided by 9. 2
1, 1, 1, 3, 3, 4, 3, 3, 5, 5, 7, 7, 6, 5, 6, 7, 8, 11, 9, 8, 9, 12, 10, 14, 13, 15, 12, 16, 16, 16, 19, 17, 12, 21, 21, 16, 21, 20, 24, 23, 24, 25, 26, 25, 24, 22, 31, 31, 29, 31, 37, 30, 32, 36, 32, 35, 34, 37, 36, 39, 39, 41, 38, 39, 51, 47, 48, 35, 42, 48 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,4

COMMENTS

(sum of digits of n!) / 9 is an integer for n > 5.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 6..10000

FORMULA

a(n) = A004152(n)/9.

MATHEMATICA

Table[Sum[DigitCount[n!][[i]]*i/9, {i, 1, 9}], {n, 6, 100}]

PROG

(PARI) a(n) = sumdigits(n!)/9; \\ Michel Marcus, Aug 12 2022

CROSSREFS

Cf. A004152, A086358.

Sequence in context: A121937 A003034 A091282 * A027684 A276864 A342928

Adjacent sequences: A202705 A202706 A202707 * A202709 A202710 A202711

KEYWORD

nonn,base,easy

AUTHOR

Michel Lagneau, Dec 23 2011

STATUS

approved

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Last modified December 8 08:22 EST 2022. Contains 358693 sequences. (Running on oeis4.)