User contributions
- 10:03, 28 November 2010 (diff | hist) . . (-52) . . User:Stefanp (current)
- 09:59, 28 November 2010 (diff | hist) . . (+63) . . User:Stefanp
- 08:45, 28 November 2010 (diff | hist) . . (+41) . . N User:Stefanp (Created page with '1) Is 12345678987654321 a perfect square?')