The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A199423 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A199423

Greatest prime factor of n and 2*n+1
(history; published version)

#13 by Michel Marcus at Sat Dec 19 10:35:47 EST 2020

STATUS

reviewed

approved

#12 by Joerg Arndt at Sat Dec 19 10:18:02 EST 2020

STATUS

proposed

reviewed

#11 by Georg Fischer at Sat Dec 19 09:06:12 EST 2020

STATUS

editing

proposed

#10 by Georg Fischer at Sat Dec 19 09:05:58 EST 2020

FORMULA

a(n) = A006520A006530(A014105(n)).

STATUS

approved

editing

Discussion

Sat Dec 19

09:06

Georg Fischer: Typo

#9 by Harvey P. Dale at Wed Mar 25 18:27:01 EDT 2020

STATUS

editing

approved

#8 by Harvey P. Dale at Wed Mar 25 18:26:59 EDT 2020

LINKS

Harvey P. Dale, <a href="/A199423/b199423.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#7 by Harvey P. Dale at Wed Mar 25 18:25:43 EDT 2020

STATUS

editing

approved

#6 by Harvey P. Dale at Wed Mar 25 18:25:40 EDT 2020

MATHEMATICA

Table[Max[Flatten[FactorInteger[{n, 2 n+1}], 1][[All, 1]]], {n, 70}] (* Harvey P. Dale, Mar 25 2020 *)

STATUS

approved

editing

#5 by Russ Cox at Fri Mar 30 17:35:25 EDT 2012

AUTHOR

_Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), _, Nov 06 2011

Discussion

Fri Mar 30

17:35

OEIS Server: https://oeis.org/edit/global/165

#4 by T. D. Noe at Sun Nov 06 13:44:46 EST 2011

STATUS

proposed

approved