The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A110920

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A110920

Integers n such that 2*10^n + 81 is a prime number.
(history; published version)

#20 by Charles R Greathouse IV at Thu Jan 17 13:44:08 EST 2019

LINKS

Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/prime/">List of near-repdigit-related prime numbers</a>.

Discussion

Thu Jan 17

13:44

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

#19 by N. J. A. Sloane at Fri Jan 20 13:07:54 EST 2017

STATUS

proposed

approved

#18 by Jon E. Schoenfield at Thu Jan 19 23:10:03 EST 2017

STATUS

editing

proposed

#17 by Jon E. Schoenfield at Thu Jan 19 23:10:00 EST 2017

EXTENSIONS

a(19)-a(21) by _from _Robert Price_, Jan 19 2017

STATUS

proposed

editing

#16 by Jon E. Schoenfield at Thu Jan 19 23:09:46 EST 2017

STATUS

editing

proposed

#15 by Jon E. Schoenfield at Thu Jan 19 23:09:44 EST 2017

NAME

Integers n such that 2*10^n + 81 is a prime number.

EXAMPLE

n = 3 is a member term because 2*10^3 + 81 = 2*1000 + 81 = 2000 + 81 = 2081 and 2081 is prime.

STATUS

reviewed

editing

#14 by Joerg Arndt at Thu Jan 19 12:52:22 EST 2017

STATUS

proposed

reviewed

#13 by Robert Price at Thu Jan 19 12:32:14 EST 2017

STATUS

editing

proposed

#12 by Robert Price at Thu Jan 19 12:31:36 EST 2017

DATA

0, 1, 2, 3, 6, 7, 8, 15, 36, 38, 51, 168, 1000, 2955, 8151, 16456, 17902, 18784, 24948, 28731, 87144

OFFSET

1,13

COMMENTS

a(22) > 10^5. - Robert Price, Jan 19 2017

EXTENSIONS

a(1315)-a(1618) from Kamada link by Ray Chandler, Dec 23 2010

a(1)-a(2) prepended by Robert Price, Jan 19 2017

a(19)-a(21) by Robert Price, Jan 19 2017

STATUS

approved

editing

#11 by N. J. A. Sloane at Wed Apr 22 17:54:43 EDT 2015

LINKS

Makoto Kamada, <a href="http://homepage2.niftystdkmd.com/m_kamadanrr/mathprime/factorizations.htm#primenumbers">List of near-repdigit-related prime numbers</a>.

Discussion

Wed Apr 22

17:54

OEIS Server: https://oeis.org/edit/global/2425