perplexus.info :: Just Math : Repunit Rigor II

Repunit Rigor II (Posted on 2013-10-01)

sod(n) denotes the sum of the digits of a base ten positive integer n, and:
R_t = 11...11 (the digit 1 repeated precisely t times.)

Determine the values of t for which:

sod(R_t²) = (sod(R_t))²

No Solution Yet Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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Subject	Author	Date
Answers	Math Man	2013-10-05 23:45:50
upper limit	Daniel	2013-10-02 10:36:11
computer exploration	Charlie	2013-10-01 19:35:16

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