The On-Line Encyclopedia of Integer Sequences (OEIS)

The OEIS is supported by the many generous donors to the OEIS Foundation.

Revision History for A248919

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A248919

"Stubborn primes" (see comments in A232210).
(history; published version)

#32 by N. J. A. Sloane at Mon Jan 02 12:30:50 EST 2023

LINKS

Vladimir Shevelev, <a href="http://list.seqfan.eu/pipermailoldermail/seqfan/2014-September/013620.html">"Stubborn primes"</a>

Discussion

Mon Jan 02

12:30

OEIS Server: https://oeis.org/edit/global/2957

#31 by N. J. A. Sloane at Sat Oct 25 22:54:29 EDT 2014

STATUS

proposed

approved

#30 by Michel Marcus at Sat Oct 25 08:18:50 EDT 2014

STATUS

editing

proposed

#29 by Michel Marcus at Sat Oct 25 08:18:09 EDT 2014

COMMENTS

Note that, for a(n), n=1,...,7, the number of digits of the smallest prime of the form a(n)*10^k+3...3 (k 3's) respectively equals 16, 26, 53, 255, 4756, 6525, 9677. Judging from the ratio 4756/255 > 18.65, the smallest prime of the form 262933...3 could have more than 180000 digits.

a(n)*10^k+3...3 (k 3's) respectively equals 16, 26, 53, 255, 4756, 6525, 9677. Judging from the ratio 4756/255 > 18.65, the smallest prime of the form 262933...3 could have more than 180000 digits.

STATUS

proposed

editing

Discussion

Sat Oct 25

08:18

Michel Marcus: ok to remove break ?

#28 by Vladimir Shevelev at Sat Oct 25 05:02:51 EDT 2014

STATUS

editing

proposed

Discussion

Sat Oct 25

05:07

Michel Marcus: I did several attemts do not separate a and n in a(n).
What do you mean ?

05:23

Vladimir Shevelev: Here I saw "a" on a one line, while (n) on the other one.

#27 by Vladimir Shevelev at Sat Oct 25 04:59:14 EDT 2014

COMMENTS

Note that, for a(n), n=1,...,7, the number of digits of the smallest prime of the form

Discussion

Sat Oct 25

05:02

Vladimir Shevelev: OK, thanks! I did several attemts do not separate a and n in a(n).

#26 by Vladimir Shevelev at Sat Oct 25 04:57:59 EDT 2014

COMMENTS

#25 by Vladimir Shevelev at Sat Oct 25 04:56:51 EDT 2014

COMMENTS

#24 by Vladimir Shevelev at Sat Oct 25 04:52:34 EDT 2014

COMMENTS

Note that, for a(n), n=1,...,7, the number of digits of the first "stubborn" primes smallest prime of the form a(n)*10^k+3...3 (k 3's) respectively equals 16, 26, 53, 255, 4756, 6525, 9677. Judging from the ratio 4756/255 > 18.65, the smallest prime of the form 262933...3 could have more than 180000 digits.

#23 by Vladimir Shevelev at Sat Oct 25 04:39:42 EDT 2014

COMMENTS

Note that, for a(n), n=1,...,7, the number of digits of the smallest prime of the form a(n)*10^k+3...3 (k 3's) first "stubborn" primes respectively equals 16, 26, 53, 255, 4756, 6525, 9677. Judging from the ratio 4756/255 > 18.65, the smallest prime of the form 262933...3 could have more than 180000 digits.

STATUS

proposed

editing