The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A103463

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A103463

Length of the largest left-truncatable prime (in base n).
(history; published version)

#26 by Alois P. Heinz at Tue Feb 28 05:35:23 EST 2023

STATUS

reviewed

approved

#25 by Amiram Eldar at Tue Feb 28 05:20:45 EST 2023

STATUS

proposed

reviewed

#24 by Michel Marcus at Tue Feb 28 04:52:26 EST 2023

STATUS

editing

proposed

#23 by Michel Marcus at Tue Feb 28 04:52:20 EST 2023

COMMENTS

The next term (base 30) will be difficult to calculate because there are over a trillion left-truncatable primes in that base for each of digit-lengths 29-34. Nevertheless, the largest left-truncatable prime in this base can be estimated by theory to have a length of about 82. [_Hans Havermann, _, Aug 16 2011]

LINKS

Eric Weisstein: 's World of Mathematics, <a href="http://mathworld.wolfram.com/TruncatablePrime.html">Truncatable Prime</a>.

KEYWORD

nonn,base,more

STATUS

approved

editing

#22 by N. J. A. Sloane at Fri Feb 05 00:35:37 EST 2021

STATUS

editing

approved

#21 by N. J. A. Sloane at Fri Feb 05 00:35:22 EST 2021

LINKS

Martin Renner, <a href="/A103463/a103463.txt">Table of n, a(n) for n = 2..53 (with some question marks)</a>

STATUS

proposed

editing

Discussion

Fri Feb 05

00:35

N. J. A. Sloane: done!  good catch!

#20 by Hans Havermann at Thu Feb 04 12:25:33 EST 2021

STATUS

editing

proposed

#19 by Hans Havermann at Thu Feb 04 12:15:36 EST 2021

LINKS

Roman Maeder, <a href="https://community.wolfram.com/groups/-/m/t/1569707">A Prime Pencil</a>

STATUS

approved

editing

Discussion

Thu Feb 04

12:25

Hans Havermann: The Martin Renner a-file link is seriously outdated as some of the question marks were already exposed by my own extension in 2011 and, more recently, by Sander Huisman's extensions in the Roman Maeder link. Perhaps it should be removed.

#18 by Joerg Arndt at Sun Apr 22 04:48:44 EDT 2018

STATUS

proposed

approved

#17 by Michel Marcus at Sun Apr 22 02:28:10 EDT 2018

STATUS

editing

proposed