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A004782
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2(2n-3)!/n!(n-1)! is an integer.
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1
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2, 3, 7, 16, 21, 29, 43, 46, 67, 78, 89, 92, 105, 111, 127, 141, 154, 157, 171, 188, 191, 205, 210, 211, 221, 229, 232, 239, 241, 267, 277, 300, 309, 313, 316, 323, 326, 331, 346, 369, 379, 415, 421, 430, 436, 441, 443, 451, 460, 461, 465, 469, 477
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Superset of A081767, as proved by Luke Pebody. Terms not in A081767 include 3,7,127,511,... - R. Stephan, Oct 12 2004
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MATHEMATICA
| Select[Range[500], IntegerQ[2 (2 # - 3)!/(#! (# - 1)!)] &] (* Arkadiusz Wesolowski, Sep 06 2011 *)
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CROSSREFS
| Sequence in context: A133736 A058698 A058699 * A049956 A153056 A081207
Adjacent sequences: A004779 A004780 A004781 * A004783 A004784 A004785
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KEYWORD
| nonn
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AUTHOR
| R. K. Guy (rkg(AT)cpsc.ucalgary.ca)
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EXTENSIONS
| Offset corrected and initial term added by Arkadiusz Wesolowski, Sep 06 2011
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