Wednesday, 31 July 2013

Power of 2 with equal number of decimal digits?



Does there exist an integer n such that the decimal representation of 2n have an equal number of decimal digits {0,,9}, each appearing 10% of the time?



The closest I could find was n=1,287,579 of which 2n has 387,600 digits broken down as



0  38,808   10.012%
1 38,735 9.993%

2 38,786 10.007%
3 38,751 9.997%
4 38,814 10.014%
5 38,713 9.987%
6 38,731 9.992%
7 38,730 9.992%
8 38,709 9.986%
9 38,823 10.016%

Answer




No. If each digit appears x times, then the sum of all the digits will be 45x; this implies 3|2n which cannot be the case.


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