The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A020761 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A020761

Decimal expansion of 1/2.
(history; published version)

#56 by N. J. A. Sloane at Mon Apr 12 10:52:44 EDT 2021

STATUS

editing

approved

#55 by Michel Marcus at Mon Apr 12 10:51:08 EDT 2021

FORMULA

Equals Sum(_{k>=1,2,3...)} (1/3^k). Hence 1/2 = 0.1111111111111... in base 3.

STATUS

proposed

editing

#54 by David A. Corneth at Mon Apr 12 08:20:28 EDT 2021

STATUS

editing

proposed

#53 by David A. Corneth at Mon Apr 12 08:20:04 EDT 2021

LINKS

Michael Penn, <a href="https://www.youtube.com/watch?v=IXQNHqr1soo">I really like this sum!</a>, YouTube video, 2021.

STATUS

approved

editing

Discussion

Mon Apr 12

08:20

David A. Corneth: (this is a different video by Penn from the one already here)

#52 by R. J. Mathar at Sun Jan 17 09:49:27 EST 2021

STATUS

editing

approved

#51 by R. J. Mathar at Sun Jan 17 09:49:20 EST 2021

FORMULA

Equals 2*A019824*A019884. - R. J. Mathar, Jan 17 2021

STATUS

approved

editing

#50 by N. J. A. Sloane at Fri Dec 18 04:22:36 EST 2020

STATUS

proposed

approved

#49 by David A. Corneth at Thu Dec 17 16:25:40 EST 2020

STATUS

editing

proposed

#48 by David A. Corneth at Thu Dec 17 16:25:37 EST 2020

LINKS

Michael Penn, <a href="https://www.youtube.com/watch?v=hJzIZNvscpM">A creative approach to a scary looking integral.</a>, YouTube video, 2020.

STATUS

approved

editing

#47 by Ray Chandler at Wed Jul 15 15:12:21 EDT 2015

STATUS

editing

approved