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A080397 Largest squarefree number dividing central binomial coefficient A000984(n). 3
1, 2, 6, 10, 70, 42, 462, 858, 4290, 24310, 92378, 176358, 1352078, 520030, 222870, 6463230, 200360130, 129644790, 907513530, 1767263190, 22974421470, 134564468610, 526024740930, 22870640910, 1074920122770, 1504888171878 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

FORMULA

a(n)=A007947[A000984(n)]

MAPLE

a := n -> convert(numtheory:-factorset(binomial(2*n, n)), `*`):

seq(a(n), n=0..25); # Peter Luschny, Oct 31 2015

CROSSREFS

Cf. A007947, A000984, A001405, A048633.

Sequence in context: A115113 A163788 A093880 * A048782 A083458 A124621

Adjacent sequences:  A080394 A080395 A080396 * A080398 A080399 A080400

KEYWORD

nonn

AUTHOR

Labos Elemer, Mar 19 2003

STATUS

approved

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Last modified June 24 11:32 EDT 2017. Contains 288697 sequences.