self Maths Puzzle

The integers 34041 and 32506 when divided by a three-digit integer n leave the same remainder. What is n ?

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self Other Question

is a triangle of 5cm, 3.3cm and 6cm obtuse?
ABCDEFGH is a regular octagon. A and E are opposite vertices of the octagon. A frogstarts jumping from vertex to vertex, beginning from A. From any vertex of the octagon except E, it may jump to either of the two adjacent vertices. When it reaches E, the frog stops and stays there. Let an be the number of distinct paths of exactly n jumps ending in E. Then, what is the value of a2n-1?