The On-Line Encyclopedia of Integer Sequences (OEIS)

The OEIS is supported by the many generous donors to the OEIS Foundation.

Revision History for A094576

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A094576

Numbers n with property that binomial (2n, n) / (n-2) is an integer.
(history; published version)

#2 by Russ Cox at Fri Mar 30 17:31:01 EDT 2012

AUTHOR

_Robert G. Wilson v (rgwv(AT)rgwv.com), _, May 11 2004

Discussion

Fri Mar 30

17:31

OEIS Server: https://oeis.org/edit/global/156

#1 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

Numbers n with property that binomial (2n, n) / (n-2) is an integer.

DATA

3, 4, 5, 6, 8, 14, 17, 20, 22, 26, 30, 42, 44, 47, 68, 74, 79, 86, 90, 93, 101, 106, 112, 122, 128, 142, 155, 158, 172, 189, 192, 200, 206, 211, 212, 218, 222, 230, 233, 240, 242, 268, 275, 278, 301, 306, 310, 314, 317, 324, 327, 332, 338, 344, 347, 370, 380, 416

OFFSET

1,1

MATHEMATICA

Select[ Range[421], Mod[Binomial[2#, # ], (# - 2)] == 0 &]

CROSSREFS

Cf. A000108, A094453, A094575.

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), May 11 2004

STATUS

approved