[seqfan] Re: "Stubborn primes"

Patrick De Geest Patrick.DeGeest at skynet.be
Sun Sep 14 16:35:42 CEST 2014

The best reference is 


-----Oorspronkelijk bericht-----
Van: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] Namens Hans Havermann
Verzonden: zondag 14 september 2014 15:45
Aan: Sequence Fanatics Discussion list
Onderwerp: [seqfan] Re: "Stubborn primes"

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".


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