MathDB
P22 [Number Theory] - Turkish NMO 1st Round - 2002

Source:

August 10, 2014
modular arithmetic

Problem Statement

If 2n2^n divides 525615^{256} - 1, what is the largest possible value of nn?
<spanclass=latexbold>a)</span> 8<spanclass=latexbold>b)</span> 10<spanclass=latexbold>c)</span> 11<spanclass=latexbold>d)</span> 12<spanclass=latexbold>e)</span> None of above <span class='latex-bold'>a)</span>\ 8 \qquad<span class='latex-bold'>b)</span>\ 10 \qquad<span class='latex-bold'>c)</span>\ 11 \qquad<span class='latex-bold'>d)</span>\ 12 \qquad<span class='latex-bold'>e)</span>\ \text{None of above}