Problem
NT-B2-M06-P008 A Parametric Formula
#8
★★★☆☆ Level 3 of 5
Find \(v_5(11^n-1)\).
\(5\mid11-1\).
By LTE, \(v_5(11^n-1)=v_5(10)+v_5(n)=1+v_5(n)\).
The answer depends on \(n\), which is expected.