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A081766 Numbers n such that n^2+1 divides C(2n,n). +0
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1, 3, 8, 13, 17, 30, 46, 47, 68, 73, 75, 93, 98, 105, 112, 122, 144, 155, 172, 183, 189, 192, 203, 217, 233, 237, 242, 254, 266, 268, 269, 278, 286, 294, 348, 380, 401, 403, 411, 423, 437, 439, 443, 456, 463, 476, 483, 489, 494, 498, 511, 520, 526, 540, 563 (list; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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