22 June 2025

• curprev 10:4310:43, 22 June 2025 Sevenoptimus talk contribs m 5,682 bytes 0 Fixed typo in Solution 4

7 September 2023

• curprev 10:0710:07, 7 September 2023 Dondee123 talk contribs 5,682 bytes +3 No edit summary
• curprev 10:0610:06, 7 September 2023 Dondee123 talk contribs 5,679 bytes +1,136 No edit summary

1 August 2023

• curprev 15:0015:00, 1 August 2023 Lucaswujc talk contribs 4,543 bytes +1,139 No edit summary

12 August 2018

• curprev 17:3817:38, 12 August 2018 Riflescoop talk contribs m 3,404 bytes +4 →Solution 2
• curprev 17:3717:37, 12 August 2018 Riflescoop talk contribs 3,400 bytes +1,054 Extra solutions

24 June 2015

• curprev 23:5123:51, 24 June 2015 Sylviajin talk contribs m 2,346 bytes −4 latex errors

9 June 2014

• curprev 04:5204:52, 9 June 2014 Hnkevin42 talk contribs 2,350 bytes +2 →Solution
• curprev 04:4904:49, 9 June 2014 Hnkevin42 talk contribs 2,348 bytes +233 →Solution
• curprev 04:4404:44, 9 June 2014 Hnkevin42 talk contribs 2,115 bytes +1,655 →Solution
• curprev 03:5203:52, 9 June 2014 Hnkevin42 talk contribs 460 bytes −379 →Solution
• curprev 03:5203:52, 9 June 2014 Hnkevin42 talk contribs 839 bytes −58 →Problem

5 January 2014

• curprev 00:0900:09, 5 January 2014 Gina talk contribs 897 bytes +62 No edit summary

4 July 2013

• curprev 09:2609:26, 4 July 2013 Nathan wailes talk contribs 835 bytes +15 No edit summary

21 February 2010

• curprev 11:3711:37, 21 February 2010 Fuzzy growl talk contribs 820 bytes +516 No edit summary

12 June 2008

• curprev 19:0519:05, 12 June 2008 El nino talk contribs 304 bytes −11 No edit summary
• curprev 19:0319:03, 12 June 2008 El nino talk contribs 315 bytes +43 No edit summary
• curprev 19:0019:00, 12 June 2008 El nino talk contribs 272 bytes +272 New page: suppose n=a*10^4+b*10^3+c*10^2+d*10+e, where a,b,c,d,e are integers between [0,9] then q=a*10^2+b*10+c, r=d*10+e, and (q+r)%11 = n%11, since 10000<n<99999 there are 9090-910+1=8181 n valu...