The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A000989

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A000989

3-adic valuation of binomial(2*n, n): largest k such that 3^k divides binomial(2*n, n).
(history; published version)

#51 by Michel Marcus at Fri Feb 12 04:03:21 EST 2021

STATUS

reviewed

#50 by Joerg Arndt at Fri Feb 12 03:31:42 EST 2021

STATUS

proposed

#49 by Amiram Eldar at Fri Feb 12 02:52:16 EST 2021

STATUS

editing

#48 by Amiram Eldar at Fri Feb 12 02:45:08 EST 2021

LINKS

FORMULA

CROSSREFS

Cf. A000984, A005836, A007949.

#47 by Amiram Eldar at Fri Feb 12 02:42:09 EST 2021

NAME

3-adic valuation of binomial(2n ,n): largest k such that 3^k divides binomial(2n ,n).

LINKS

Michael Gilleland, <a href="/selfsimilar.html">Some Self-Similar Integer Sequences</a>

Wikipedia, <a href="https://en.wikipedia.org/wiki/Kummer's_theorem">Kummer's theorem</a>

STATUS

approved

#46 by Michael Somos at Sat Nov 05 17:54:42 EDT 2016

STATUS

editing

#45 by Michael Somos at Sat Nov 05 17:54:18 EDT 2016

NAME

3-adic valuation of binomial(2n,n): largest k such that 3^k divides binomial(2n,n).

PROG

(PARI) a(n)=valuation(binomial(2*n, n), 3)

STATUS

proposed

Discussion

Sat Nov 05

17:54

Michael Somos: Space edits.

#44 by Jon E. Schoenfield at Sat Nov 05 15:49:34 EDT 2016

STATUS

editing

#43 by Jon E. Schoenfield at Sat Nov 05 15:49:32 EDT 2016

NAME

3-adic valuation of C(2n,n): largest k such that 3^k divides C(2n,n).

STATUS

proposed

#42 by Wesley Ivan Hurt at Mon Oct 31 11:21:49 EDT 2016

STATUS

editing