AMC 10 Step by Step
2005 AMC 10AProblem 21P21-25~3 minPrint

For how many positive integers nn does 1+2++n1+2+\dotsb+n evenly divide 6n6n ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.