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Revision History for A256957

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A256957

Smallest palindromic prime that generates a palindromic prime pyramid of height n.
(history; published version)

#15 by Alois P. Heinz at Tue Feb 06 09:24:04 EST 2018

STATUS

reviewed

approved

#14 by Michel Marcus at Tue Feb 06 08:25:49 EST 2018

STATUS

proposed

reviewed

#13 by G. L. Honaker, Jr. at Tue Feb 06 08:21:18 EST 2018

STATUS

editing

proposed

#12 by G. L. Honaker, Jr. at Tue Feb 06 08:21:07 EST 2018

LINKS

G. L. Honaker, JRJr. and Chris K. Caldwell, <a href="http://www.utm.edu/staff/caldwell/preprints/jrm_prime_pyramids.pdf">Palindromic prime pyramids</a>

STATUS

approved

editing

#11 by N. J. A. Sloane at Fri Dec 04 20:46:09 EST 2015

STATUS

editing

approved

#10 by N. J. A. Sloane at Fri Dec 04 20:46:05 EST 2015

LINKS

Chai Wah Wu, <a href="http://arxiv.org/abs/1503.08883">On a conjecture regarding primality of numbers constructed from prepending and appending identical digits</a>, arXiv:1503.08883 [math.NT], 2015.

STATUS

approved

editing

#9 by N. J. A. Sloane at Mon Apr 13 23:41:49 EDT 2015

STATUS

editing

approved

#8 by N. J. A. Sloane at Mon Apr 13 23:41:46 EDT 2015

EXAMPLE

a(1) = 11.

a(4) = 5:

5

151

31513

3315133, stop;

height(5)=4.

a(6)=16362:

16361

1163611

311636113

33116361133

3331163611333

333311636113333, stop;

height(16361)=6.

STATUS

approved

editing

#7 by N. J. A. Sloane at Mon Apr 13 23:37:19 EDT 2015

STATUS

editing

approved

#6 by N. J. A. Sloane at Mon Apr 13 23:37:16 EDT 2015

AUTHOR

N. J. A. Sloane, Apr 13 2015

Felice Russo, Jan 25 2000

EXTENSIONS

Added a(10)-a(11) and corrected a(4) - Chai Wah Wu, Apr 09 2015

Entry revised by N. J. A. Sloane, Apr 13 2015