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A173392 Product of nonzero remainders of n mod k, for k = 1,2,3,...,n. 0
1, 1, 1, 1, 2, 2, 6, 12, 24, 48, 720, 240, 2160, 23040, 45360, 40320, 2419200, 1935360, 65318400, 69672960, 163296000, 2786918400, 754427520000, 22992076800, 201180672000, 14714929152000, 211843247616000, 114776447385600, 32953394073600000, 2410305395097600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

For n = 7; 7 mod k, for k = 1,2,3,...,7: (0,1,1,3,2,1,0). Product of nonzero remainders = 6. a(7) = 6.

MATHEMATICA

Table[Times@@DeleteCases[Mod[n, Range[n]], 0], {n, 30}]

PROG

(PARI) a(n) = prod(k=1, n, if (m = n % k, m, 1)); \\ Michel Marcus, May 23 2018

CROSSREFS

Cf. A004125 (sum of remainders of n mod k).

Sequence in context: A320068 A345988 A275439 * A324128 A217211 A035615

Adjacent sequences:  A173389 A173390 A173391 * A173393 A173394 A173395

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Nov 22 2010

EXTENSIONS

Extended by T. D. Noe, Nov 22 2010

STATUS

approved

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Last modified October 18 01:39 EDT 2021. Contains 348065 sequences. (Running on oeis4.)