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A073077 Numbers n such that n divides C(2n,n) and C(4n,2n). 0
1, 2, 20, 110, 156, 210, 220, 238, 240, 312, 460, 468, 483, 510, 561, 600, 624, 665, 684, 696, 720, 744, 770, 806, 812, 816, 868, 936, 966, 1001, 1012, 1045, 1064, 1100, 1110, 1122, 1144, 1155, 1170, 1200, 1295, 1309, 1320, 1326, 1332, 1360, 1368, 1394, 1404 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..49.

PROG

(PARI) isok(n) = !(binomial(2*n, n) % n) && !(binomial(4*n, 2*n) % n); \\ Michel Marcus, Nov 28 2013

CROSSREFS

Subsequence of A014847.

Sequence in context: A052361 A001884 A028477 * A069537 A282818 A001797

Adjacent sequences:  A073074 A073075 A073076 * A073078 A073079 A073080

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Aug 17 2002

EXTENSIONS

More terms from Michel Marcus, Nov 28 2013

STATUS

approved

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Last modified August 22 12:24 EDT 2019. Contains 326177 sequences. (Running on oeis4.)