The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A286177 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A286177

Numbers k such that (17*10^k - 47)/3 is prime.
(history; published version)

#12 by Michael De Vlieger at Mon Jun 10 08:44:00 EDT 2024

STATUS

reviewed

approved

#11 by Michel Marcus at Mon Jun 10 08:06:43 EDT 2024

STATUS

proposed

reviewed

#10 by Jon E. Schoenfield at Mon Jun 10 08:02:21 EDT 2024

STATUS

editing

proposed

#9 by Jon E. Schoenfield at Mon Jun 10 08:02:18 EDT 2024

COMMENTS

For k > 1, numbers k such that the digit 5 followed by k-2 occurrences of the digit 6 followed by the digits 51 is prime (see Example section).

LINKS

Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/primedifficultyprime_difficulty.txt">Search for 56w51</a>.

EXAMPLE

Initial terms and primes associated primes:

STATUS

approved

editing

#8 by Alois P. Heinz at Fri Mar 29 18:12:27 EDT 2019

STATUS

proposed

approved

#7 by Robert Price at Fri Mar 29 15:40:39 EDT 2019

STATUS

editing

proposed

#6 by Robert Price at Fri Mar 29 15:40:28 EDT 2019

COMMENTS

a(28) > 2*10^5.

LINKS

Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/primedifficulty.txt">Search for 56w51.</a>.

STATUS

approved

editing

#5 by Charles R Greathouse IV at Thu Jan 17 13:44:09 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 56w51.</a>

Discussion

Thu Jan 17

13:44

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

#4 by N. J. A. Sloane at Wed May 03 21:58:35 EDT 2017

STATUS

proposed

approved

#3 by Robert Price at Wed May 03 20:14:59 EDT 2017

STATUS

editing

proposed