perplexus.info :: Sequences : Powers of Ten

Powers of Ten (Posted on 2015-07-14)

Does the arithmetic sequence 1, 2188, 4375, 6562, ...... contain infinitely many powers of 10?
Give reasons for your answer.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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re: Pwerful answer (spoiler)

| Comment 6 of 7 |

(In reply to Pwerful answer (spoiler) by Steve Herman)

10^244 is worth 10, not 1, mod 2187.

10^n mod 2187 = 1 solves for n=243k, not 244k.

Posted by broll on 2015-07-15 05:41:40

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