Math Forum http://mathforum.org/kb List of forum topics en Re: I need to demonstrate that 3^80 -2^20 is divisible by 5 . hint u(3^80)=1 http://mathforum.org/kb/thread.jspa?messageID=7901347&tstart=0#7901347
3^80 = 2^20 (mod 5)

now observe that:

k - natural

(3^i) mod 5 = [nb you can call this]]> Oct 5, 2012 4:13:36 PM Oct 5, 2012 4:13:36 PM ud2 0 I need to demonstrate that 3^80 -2^20 is divisible by 5 . hint u(3^80)=1 http://mathforum.org/kb/thread.jspa?messageID=7900685&tstart=0#7900685
would you be so kind to help me with the maths problem , please ?

I need to demonstrate that 3^80 -2^20 is divisible by 5]]> Oct 4, 2012 3:31:24 PM Oct 4, 2012 3:31:24 PM lenusv44 1