Prove that the fraction (21n+4)/(14n+3) is irreducible for every natural number n.

Source: Russian IMO

(In reply to hmmmm by broll)

While I'm a little like Steve in understanding how you transformed the expression to that at your end, the end expression does explain my Excel observation that the limit is 1.5, ie, (3/2 - something).

Posted by brianjn on 2013-03-30 02:58:37