[seqfan] Re: "Stubborn primes"

[Hans Havermann]

Prime 17911 requires 7428 threes but it is not a record, so you do not call it stubborn. The next three primes are 10739, 17669, and 26293. I would only call the last one stubborn.

On Sep 13, 2014, at 5:05 AM, Vladimir Shevelev <shevelev at bgu.ac.il> wrote:

> The calculated records of numbers of concatenating 3's are 1,14,23,50,252,4752 with the corresponding primes 5,13,131,653,883,1279,... Beginning with the second prime, I call them "stubborn".