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A081766 Numbers n such that n^2+1 divides C(2n,n). 1
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; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Sequence in context: A022807 A292655 A187093 * A152676 A197062 A010064

Adjacent sequences:  A081763 A081764 A081765 * A081767 A081768 A081769

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 09 2003

STATUS

approved

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Last modified October 15 20:04 EDT 2019. Contains 328037 sequences. (Running on oeis4.)