(56^n+1) / (2^3n+2 * 7^n+1)

I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...I don't no...

не совсем уверена, но возможно так: (56^n+1)/(14^3n+2+n+1)=(56^n+1)/(14^4n+3)=4^-3n-3=1/(4^n+3)