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Special indices (Posted on 2007-02-26) Difficulty: 4 of 5
Given that 5^j+6^k+7^d+11^m=2006 where j, k, d and m are different non-negative integers, what is the value of j+k+d+m?

No Solution Yet Submitted by Ansh    
Rating: 3.0000 (1 votes)

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Solution My solution Comment 3 of 3 |

I made a table of powers of 5, 6, 7 and 11 and realized there wouldn't be many possibilities to check (72 in fact, although Dennis reduced it to 12)

I started by trying m=3, 11^3=1331, 2006 - 1331 = 675.

I couldn't help but notice this is 625+50 = 625+1+49.

So the solution is 4+0+2+3=9

A deceptive problem.  It looks hard at first but is actually very easy.


  Posted by Jer on 2007-02-26 11:54:34
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