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List of forum topicsenRe: 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 PMOct 5, 2012 4:13:36 PMud20I 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 PMOct 4, 2012 3:31:24 PMlenusv441