perplexus.info :: Numbers : From eleven to ... ETERNITY

From eleven to ... ETERNITY (Posted on 2018-07-14)

Eleven is the fifth prime number, and the smallest two-digit prime.
It's also the smallest repunit prime.

What is the next repunit prime?

Submitted by Ady TZIDON

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Solution: (Hide)

All solutions must have a prime number of digits(OBVIOUS since m*n ones represents a number divisible by m ones).
Answer: 11,111,111,111,111,111,111

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
save a bit of work	Steven Lord	2018-07-14 17:12:57
computer solution	Charlie	2018-07-14 15:05:06
from the web	xdog	2018-07-14 13:29:09

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