The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A068649

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A068649

Primes in which a string of 9's is sandwiched between two 1's.
(history; published version)

#21 by Charles R Greathouse IV at Thu Jan 17 13:44:05 EST 2019

LINKS

Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/1/19991.htm#prime">Prime numbers of the form 199...991</a>.

Discussion

Thu Jan 17

13:44

OEIS Server: https://oeis.org/edit/global/2791

#20 by Joerg Arndt at Tue Aug 15 03:15:24 EDT 2017

STATUS

proposed

approved

#19 by Michel Marcus at Tue Aug 15 01:44:35 EDT 2017

STATUS

editing

proposed

#18 by Michel Marcus at Tue Aug 15 01:44:17 EDT 2017

CROSSREFS

Cf. A056250, A068645-, A068646, A068647, A068648, A068650, A068651, A082703.

STATUS

proposed

editing

Discussion

Tue Aug 15

01:44

Michel Marcus: yes

#17 by Jon E. Schoenfield at Mon Aug 14 23:35:35 EDT 2017

STATUS

editing

proposed

#16 by Jon E. Schoenfield at Mon Aug 14 23:35:24 EDT 2017

COMMENTS

The next term has 199 9's sandwiched between the starting and ending 1.

EXTENSIONS

The next term has 199 9's sandwiched between the starting and ending 1.

Discussion

Mon Aug 14

23:35

Jon E. Schoenfield: Okay?

#15 by Jon E. Schoenfield at Mon Aug 14 23:34:23 EDT 2017

CROSSREFS

Cf. A056250, A068645-A068651, A056250, A082703.

EXTENSIONS

More terms from Sascha Kurz and Harvey P. Dale, Mar 19 2002.

The next term has 199 9s 9's sandwiched between the starting and ending 1.

STATUS

approved

editing

#14 by N. J. A. Sloane at Tue Apr 21 11:42:21 EDT 2015

LINKS

Makoto Kamada, <a href="http://mada.la.coocanstdkmd.jpcom/nrr/1/19991.htm#prime">Prime numbers of the form 199...991</a>.

Discussion

Tue Apr 21

11:42

OEIS Server: https://oeis.org/edit/global/2424

#13 by Ray Chandler at Tue Nov 04 15:33:49 EST 2014

STATUS

editing

approved

#12 by Ray Chandler at Tue Nov 04 15:33:45 EST 2014

LINKS

Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp191">PDP Reference Table - 191</a>.

Makoto Kamada, <a href="http://mada.la.coocan.jp/nrr/1/19991.htm#prime">Prime numbers of the form 199...991</a>.

<a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.

CROSSREFS

Cf. A068645, A068646, A068647, A068648-A068651, A056250, A082703.

EXTENSIONS

Edited by Ray Chandler, Nov 04 2014

STATUS

approved

editing