I got the first part, but I'm having trouble showing that f(5n) is divisible by 5. Can anyone help me out? Thanks! ---Kristen 22:49, 4 March 2009 (UTC)
I got the first part, but I'm having trouble showing that f(5n) is divisible by 5. Can anyone help me out? Thanks! ---Kristen 22:49, 4 March 2009 (UTC)