The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A120228 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A120228

Numbers k such that 8+k and 8*k+1 are prime.
(history; published version)

#11 by Peter Luschny at Fri Sep 27 05:39:09 EDT 2024

STATUS

reviewed

approved

#10 by Michel Marcus at Fri Sep 27 03:51:49 EDT 2024

STATUS

proposed

reviewed

#9 by Joerg Arndt at Fri Sep 27 03:51:28 EDT 2024

STATUS

editing

proposed

#8 by Joerg Arndt at Fri Sep 27 03:51:25 EDT 2024

NAME

Numbers n k such that 8+n k and 8*nk+1 are prime.

MATHEMATICA

Select[Range[800], AllTrue[{8+#, 8#+1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* __Harvey P. Dale_, May 28 2016 *)

STATUS

proposed

editing

#7 by Joerg Arndt at Fri Sep 27 03:49:16 EDT 2024

STATUS

editing

proposed

#6 by Joerg Arndt at Fri Sep 27 03:49:14 EDT 2024

COMMENTS

Cases a=4 A120226, a=5 A120227, a=6 A120222. Prime numbers p such that a+p and a*p+1 are prime A106057-A106066.

#5 by Joerg Arndt at Fri Sep 27 03:48:50 EDT 2024

NAME

Numbers n such that a8+n and a8*n+1 are prime, case a=8.

STATUS

approved

editing

#4 by Harvey P. Dale at Sat May 28 13:09:00 EDT 2016

STATUS

editing

approved

#3 by Harvey P. Dale at Sat May 28 13:08:55 EDT 2016

LINKS

Harvey P. Dale, <a href="/A120228/b120228.txt">Table of n, a(n) for n = 1..1000</a>

MATHEMATICA

Select[Range[800], AllTrue[{8+#, 8#+1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, May 28 2016 *)

STATUS

approved

editing

#2 by Russ Cox at Fri Mar 30 17:26:21 EDT 2012

AUTHOR

_Zak Seidov (zakseidov(AT)yahoo.com), _, Jun 10 2006

Discussion

Fri Mar 30

17:26

OEIS Server: https://oeis.org/edit/global/139