The On-Line Encyclopedia of Integer Sequences (OEIS)

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A101132

Indices of primes in sequence defined by A(0) = 79, A(n) = 10*A(n-1) - 71 for n > 0.
(history; published version)

#15 by Charles R Greathouse IV at Thu Jan 17 13:44:06 EST 2019

LINKS

Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/7/71119.htm#prime">Prime numbers of the form 711...119</a>.

Discussion

Thu Jan 17

13:44

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

#14 by Alois P. Heinz at Mon Sep 21 15:34:38 EDT 2015

STATUS

proposed

approved

#13 by Robert Price at Mon Sep 21 15:24:01 EDT 2015

STATUS

editing

proposed

#12 by Robert Price at Mon Sep 21 15:23:56 EDT 2015

COMMENTS

a(13) > 10^5. - Robert Price, Sep 21 2015

MATHEMATICA

Select[Range[0, 100000], PrimeQ[(640*10^# + 71)/9] &] (* Robert Price, Sep 21 2015 *)

STATUS

approved

editing

#11 by Ray Chandler at Wed Apr 29 20:07:01 EDT 2015

STATUS

editing

approved

#10 by Ray Chandler at Wed Apr 29 20:06:56 EDT 2015

DATA

0, 1, 3, 16, 24, 31, 49, 73, 172, 1723, 2083, 11397

EXTENSIONS

a(12) from Kamada data by Ray Chandler, Apr 29 2015

STATUS

approved

editing

#9 by Ray Chandler at Wed Apr 29 20:04:44 EDT 2015

STATUS

editing

approved

#8 by Ray Chandler at Wed Apr 29 20:04:40 EDT 2015

LINKS

Makoto Kamada, <a href="http://stdkmd.com/nrr/7/71119.htm#prime">Factorizations of near-repdigit Prime numbers of the form 711...119</a>.

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

FORMULA

a(n) = A103051(n) - 1.

CROSSREFS

Cf. A000533, A002275, A103051.

a(n) = A103051(n) - 1.

STATUS

approved

editing

#7 by N. J. A. Sloane at Wed Apr 22 17:56:19 EDT 2015

LINKS

Makoto Kamada, <a href="http://homepage2.niftystdkmd.com/m_kamada/mathnrr/factorizations.htm">Factorizations of near-repdigit numbers</a>.

Discussion

Wed Apr 22

17:56

OEIS Server: https://oeis.org/edit/global/2426

#6 by Russ Cox at Fri Mar 30 17:27:43 EDT 2012

AUTHOR

_Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) _ and Walter Oberschelp (oberschelp(AT)informatik.rwth-aachen.de), Dec 03 2004

Discussion

Fri Mar 30

17:27

OEIS Server: https://oeis.org/edit/global/145