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A004784 Numbers k such that 4!*(2k-5)!/(k!*(k-1)!) is an integer. 0
3, 4, 5, 211, 461, 562, 947, 990, 991, 1223, 1378, 1458, 1600, 1892, 2015, 2069, 2147, 2185, 2333, 2480, 2481, 2666, 2994, 3011, 3017, 3356, 3418, 3433, 3442, 3478, 3479, 3485, 3521, 3554, 3566, 3571, 3620, 3628, 3725, 3809, 3997, 4090, 4096 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[16^3], IntegerQ[4! (2 # - 5)!/(#! (# - 1)!)] &] (* Arkadiusz Wesolowski, Sep 06 2011 *)
CROSSREFS
Sequence in context: A163483 A327876 A363477 * A338056 A321404 A024687
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 2 15:08 EST 2024. Contains 370494 sequences. (Running on oeis4.)