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Repunit Rigor II (Posted on 2013-10-01) Difficulty: 3 of 5
sod(n) denotes the sum of the digits of a base ten positive integer n, and:
Rt = 11...11 (the digit 1 repeated precisely t times.)

Determine the values of t for which:
sod(Rt2) = (sod(Rt))2

No Solution Yet Submitted by K Sengupta    
Rating: 5.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionAnswersMath Man2013-10-05 23:45:50
upper limitDaniel2013-10-02 10:36:11
Solutioncomputer explorationCharlie2013-10-01 19:35:16
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