The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A103094

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A103094

Numbers n such that 9*10^n + 2*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
(history; published version)

#17 by Charles R Greathouse IV at Thu Jan 17 13:44:07 EST 2019

LINKS

Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/9/92223.htm#prime">Prime numbers of the form 922...223</a>.

Discussion

Thu Jan 17

13:44

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

#16 by Joerg Arndt at Sat Oct 31 10:52:43 EDT 2015

STATUS

reviewed

approved

#15 by Michel Marcus at Sat Oct 31 10:42:54 EDT 2015

STATUS

proposed

reviewed

#14 by Robert Price at Sat Oct 31 10:12:35 EDT 2015

STATUS

editing

proposed

#13 by Robert Price at Sat Oct 31 10:12:24 EDT 2015

DATA

5, 29, 60, 147, 186, 456, 678, 1373, 3378, 15726, 68231

COMMENTS

a(12) > 10^5. - Robert Price, Oct 31 2015

EXTENSIONS

a(11) from Robert Price, Oct 31 2015

STATUS

approved

editing

#12 by Ray Chandler at Tue Apr 28 11:53:08 EDT 2015

STATUS

editing

approved

#11 by Ray Chandler at Tue Apr 28 11:53:04 EDT 2015

FORMULA

a(n) = A101002(n) + 1.

CROSSREFS

Cf. A002275, A101002.

STATUS

approved

editing

#10 by Ray Chandler at Thu Apr 23 10:37:45 EDT 2015

STATUS

editing

approved

#9 by Ray Chandler at Thu Apr 23 10:37:42 EDT 2015

LINKS

Makoto Kamada, <a href="http://homepage2.niftystdkmd.com/m_kamadanrr/math9/92223.htm#prime">Factorizations Prime numbers of the form 922...223</a>.

STATUS

approved

editing

#8 by Russ Cox at Fri Mar 30 19:00:35 EDT 2012

EXTENSIONS

a(10) from Kamada data by _Robert Price (pamandbobprice(AT)yahoo.com), _, Dec 14 2010

Discussion

Fri Mar 30

19:00

OEIS Server: https://oeis.org/edit/global/305