The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A089192 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A089192

Numbers n such that 2n - 7 is a prime.
(history; published version)

#29 by Joerg Arndt at Sun Feb 04 01:16:20 EST 2024

STATUS

editing

approved

#28 by Joerg Arndt at Sun Feb 04 01:16:18 EST 2024

MATHEMATICA

lst={}; Do[If[PrimeQ[2*n-7], (*Print[n]; *)AppendTo[lst, n]], {n, 6!}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 26 2008 *)

#27 by Paolo P. Lava at Sat Feb 03 07:57:31 EST 2024

COMMENTS

Solutions of the equation (2*n-7)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Nov 15 2012

STATUS

approved

editing

#26 by Alois P. Heinz at Wed May 02 14:51:59 EDT 2018

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proposed

approved

#25 by Shawn A. Broyles at Wed May 02 14:39:19 EDT 2018

STATUS

editing

proposed

#24 by Shawn A. Broyles at Wed May 02 14:39:09 EDT 2018

LINKS

Shawn A. Broyles, <a href="/A089192/b089192.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#23 by Charles R Greathouse IV at Tue Apr 28 17:11:21 EDT 2015

STATUS

editing

approved

#22 by Charles R Greathouse IV at Tue Apr 28 17:10:58 EDT 2015

PROG

(PARI) is(n)=isprime(2*n - 7) \\ Charles R Greathouse IV, Apr 28 2015

STATUS

approved

editing

#21 by N. J. A. Sloane at Fri Jan 16 19:18:47 EST 2015

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proposed

approved

#20 by Jon E. Schoenfield at Fri Jan 16 19:07:55 EST 2015

STATUS

editing

proposed