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A004783 Numbers k such that 3!*(2k-4)!/(k!*(k-1)!) is an integer. 0
2, 3, 4, 7, 13, 16, 19, 21, 29, 43, 46, 67, 78, 85, 89, 92, 100, 105, 111, 121, 127, 141, 154, 157, 171, 188, 191, 199, 205, 210, 211, 217, 221, 229, 232, 239, 241, 267, 274, 277, 300, 309, 313, 316, 323, 326, 331, 343, 346, 369, 379, 415, 421, 430 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[500], IntegerQ[3! (2 # - 4)!/(#! (# - 1)!)] &] (* Arkadiusz Wesolowski, Sep 06 2011 *)
CROSSREFS
Sequence in context: A022437 A057983 A200088 * A031149 A096723 A266498
KEYWORD
nonn
AUTHOR
EXTENSIONS
Offset corrected and 2 initial terms added by Arkadiusz Wesolowski, Sep 06 2011
STATUS
approved

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Last modified March 4 10:03 EST 2024. Contains 370528 sequences. (Running on oeis4.)