The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A098512 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A098512

Second column and subdiagonal of number triangle A098509.
(history; published version)

#14 by Alois P. Heinz at Sun Mar 04 21:17:44 EST 2018

STATUS

proposed

approved

#13 by Jon E. Schoenfield at Sun Mar 04 21:14:02 EST 2018

STATUS

editing

proposed

#12 by Jon E. Schoenfield at Sun Mar 04 21:13:59 EST 2018

FORMULA

a(n) = C(n) / gcd(n, C(n)). - _Peter Luschny, _, Oct 06 2011

STATUS

proposed

editing

#11 by Jon E. Schoenfield at Sun Mar 04 21:13:24 EST 2018

STATUS

editing

proposed

#10 by Jon E. Schoenfield at Sun Mar 04 21:13:20 EST 2018

NAME

Second column and sub-diagonal subdiagonal of number triangle A098509.

FORMULA

a(n) = denominator(n(n+1)/binomial(2n, n)).

a(n) = denominator(n/C(n)) . - Paul Barry, Nov 17 2004

a(n) = C(n) / gcd(n,C(n)) . - Peter Luschny, Oct 06 2011

MAPLE

A098512 := n -> C(n)/igcd(n, C(n)): # _Peter Luschny, _, Oct 06 2011

STATUS

approved

editing

#9 by Russ Cox at Fri Mar 30 18:59:00 EDT 2012

FORMULA

a(n)=denominator(n/C(n)) - _Paul Barry (pbarry(AT)wit.ie), _, Nov 17 2004

AUTHOR

_Paul Barry (pbarry(AT)wit.ie), _, Sep 11 2004

Discussion

Fri Mar 30

18:59

OEIS Server: https://oeis.org/edit/global/287

#8 by T. D. Noe at Thu Oct 06 13:26:24 EDT 2011

STATUS

editing

approved

#7 by T. D. Noe at Thu Oct 06 13:26:21 EDT 2011

FORMULA

a(n)= C(n) / gcd(n,C(n)) - Peter Luschny, Oct 6 06 2011

MAPLE

A098512 := n -> C(n)/igcd(n, C(n)): # Peter Luschny, Oct 6 06 2011

STATUS

approved

editing

#6 by T. D. Noe at Thu Oct 06 13:26:02 EDT 2011

STATUS

proposed

approved

#5 by Peter Luschny at Thu Oct 06 12:46:07 EDT 2011

STATUS

editing

proposed