The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A272830 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A272830

Numbers k such that (8*10^k - 29)/3 is prime.
(history; published version)

#17 by Joerg Arndt at Thu May 02 04:27:25 EDT 2024

STATUS

proposed

approved

#16 by Jon E. Schoenfield at Thu May 02 04:16:45 EDT 2024

STATUS

editing

proposed

#15 by Jon E. Schoenfield at Thu May 02 04:15:49 EDT 2024

LINKS

Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/primedifficultyprime_difficulty.txt">Search for 26w57</a>.

Discussion

Thu May 02

04:16

Jon E. Schoenfield: Done. Thanks for pointing out the problem with these links!

#14 by Hugo Pfoertner at Thu May 02 03:37:50 EDT 2024

STATUS

proposed

editing

#13 by Jon E. Schoenfield at Thu May 02 03:35:25 EDT 2024

STATUS

editing

proposed

Discussion

Thu May 02

03:37

Hugo Pfoertner: I don't understand why we don't also fix the invalid link to Kamada's primedifficulty website while we're getting to these sequences.

#12 by Jon E. Schoenfield at Thu May 02 03:35:15 EDT 2024

COMMENTS

For nk > 1, numbers n k such that the digit 2 followed by nk-2 occurrences of the digit 6 followed by the digits 57 is prime (see Example section).

LINKS

Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/primedifficulty.txt">Search for 26w57.</a>.

EXAMPLE

Initial terms and primes associated primes:

STATUS

approved

editing

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

LINKS

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

Makoto Kamada, <a href="httphttps://stdkmd.comnet/nrr/prime/primedifficulty.txt">Search for 26w57.</a>

Discussion

Thu Jan 17

13:44

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

#10 by Joerg Arndt at Wed Jul 04 02:05:55 EDT 2018

STATUS

reviewed

approved

#9 by Michel Marcus at Wed Jul 04 00:13:18 EDT 2018

STATUS

proposed

reviewed

#8 by Robert Price at Tue Jul 03 19:22:34 EDT 2018

STATUS

editing

proposed