7 June 2021

• curprev 21:0521:05, 7 June 2021 MRENTHUSIASM talk contribs 7,539 bytes −27 →Problem 1

6 December 2019

• curprev 03:4603:46, 6 December 2019 P groudon talk contribs 7,566 bytes +295 →Problem 11

19 February 2019

• curprev 20:0420:04, 19 February 2019 P groudon talk contribs 7,271 bytes +152 No edit summary

7 September 2018

• curprev 06:3606:36, 7 September 2018 P groudon talk contribs 7,119 bytes +84 No edit summary

21 June 2016

• curprev 08:3008:30, 21 June 2016 Aboveaverage talk contribs m 7,035 bytes +1 →Problem 5

29 December 2015

• curprev 18:3418:34, 29 December 2015 -- -- talk contribs 7,034 bytes 0 →Problem 11

23 June 2014

• curprev 13:0713:07, 23 June 2014 Mathcool2009 talk contribs 7,034 bytes +6 →Problem 11: I made the diagram more clear than before--the old diagram implies that the centers of the disks are on C, which is false.

4 July 2013

• curprev 18:2018:20, 4 July 2013 Nathan wailes talk contribs 7,028 bytes +15 No edit summary

2 January 2009

• curprev 17:1917:19, 2 January 2009 Azjps talk contribs m 7,013 bytes +29 No edit summary

2 March 2008

• curprev 22:5222:52, 2 March 2008 1=2 talk contribs 6,984 bytes −70 No edit summary

2 March 2007

• curprev 01:4501:45, 2 March 2007 Minsoens talk contribs 7,054 bytes +6,001 No edit summary

9 July 2006

• curprev 09:2409:24, 9 July 2006 Joml88 talk contribs 1,053 bytes +1,053 No edit summary