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2^(10n) (Posted on 2015-04-15) Difficulty: 2 of 5
210 = 1024
220 = 1048576
Note that raising 2 to each of the first two multiples of 10 results in a number whose first digit is 1.

Find the smallest multiple of 10 where 2 raising to that power results in a number that does not begin with 1.

See The Solution Submitted by Jer    
Rating: 1.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): worked out | Comment 6 of 8 |
(In reply to re: worked out by Ady TZIDON)

291 through 299 are not multiples of 10.
  Posted by Charlie on 2015-04-16 08:06:54

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