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Oleg or Erdös? (Posted on 2017-05-26) Difficulty: 4 of 5
Oleg and (the ghost of) Erdös play the following game. Oleg chooses a non- negative integer a1 with at most 1000 digits.

In Round i the following happens:
Oleg tells the number ai to Erdös, who then chooses a non negative integer bi, and then Oleg defines ai+1 = |ai-bi| or ai+1 = ai + bi.
Erdös wins if a20 is a power of 10, otherwise Oleg wins.

Who is the winner, Oleg or Erdös?

No Solution Yet Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: Erdös wins!Steve Herman2017-05-28 09:58:54
Erdös wins!broll2017-05-28 02:07:12
re: ThoughtsSteve Herman2017-05-27 22:28:50
re(3): my solutionDaniel2017-05-27 09:59:44
ThoughtsBrian Smith2017-05-27 09:56:49
re(2): my solutionDaniel2017-05-27 09:49:29
Hints/Tipsre: my solutionAdy TZIDON2017-05-27 05:39:08
my solutionDaniel2017-05-26 14:51:54
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