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A007919 Smallest k such that k*n is a double factorial. 1
1, 1, 1, 2, 3, 8, 15, 1, 105, 384, 945, 4, 10395, 46080, 1, 3, 2027025, 2560, 34459425, 192, 5, 3715891200, 13749310575, 2, 81081, 1961990553600, 35, 23040, 213458046676875, 128, 6190283353629375, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Robert G. Wilson v, Table of n, a(n) for n = 1..817

F. Smarandache, Only Problems, Not Solutions!.

Index entries for sequences related to factorial numbers

MATHEMATICA

f[n_] := Block[{k = 1}, While[Mod[k!!, n] > 0, k++];   k!!/n]; Array[f, 35] (* Robert G. Wilson v, Feb 18 2018 *)

CROSSREFS

Cf. A006882.

Sequence in context: A005316 A076876 A124495 * A249167 A205101 A069752

Adjacent sequences:  A007916 A007917 A007918 * A007920 A007921 A007922

KEYWORD

nonn

AUTHOR

R. Muller

EXTENSIONS

a(10) corrected by Sean A. Irvine, Feb 18 2018

STATUS

approved

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Last modified November 18 16:10 EST 2018. Contains 317323 sequences. (Running on oeis4.)