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Divisible by 7 (Posted on 2007-02-15) Difficulty: 3 of 5
Prove that if A = ½(15+√197), then 7 is a factor of [A^n] for all positive integer values of n, where [w] denotes the greatest integer less than or equal to w.

See The Solution Submitted by Dennis    
Rating: 4.0000 (1 votes)

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  Subject Author Date
SolutionArek2007-03-05 07:26:24
Hints/Tipsre(3): Look for the conjugateDennis2007-02-26 12:14:00
Some Thoughtsre(2):Look 4 the conjugate.... still openAdy TZIDON2007-02-26 08:16:13
Some Thoughtsre:Look 4 the conjugateDennis2007-02-25 21:39:20
SolutionLOOK 4 THE CONJUGATEAdy TZIDON2007-02-25 16:23:23
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