The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A175283 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A175283

Numbers k with the property that k and k^2 + 3k+9 are primes.
(history; published version)

#8 by Charles R Greathouse IV at Thu Sep 08 08:45:51 EDT 2022

PROG

(MAGMAMagma) [ n: n in [0..1250] | IsPrime(n) and IsPrime(n^2+3*n+9)] // Vincenzo Librandi, Jan 30 2011

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#7 by Joerg Arndt at Sun Jan 21 02:24:33 EST 2018

STATUS

proposed

approved

#6 by Jon E. Schoenfield at Sat Jan 20 18:00:20 EST 2018

STATUS

editing

proposed

Discussion

Sun Jan 21

01:18

Michel Marcus: such that ?

#5 by Jon E. Schoenfield at Sat Jan 20 18:00:17 EST 2018

NAME

Numbers n k with the property that n k and nk^2 +3n 3k+9 are primes.

PROG

(MAGMA) [ n: n in [0..1250] | IsPrime(n) and IsPrime(n^2+3*n+9)] [From // _Vincenzo Librandi, _, Jan 30 2011]

CROSSREFS

Cf. A005471, A175281-2, A175282.

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 17:26:31 EDT 2012

AUTHOR

_Zak Seidov (zakseidov(AT)yahoo.com), _, Mar 21 2010

Discussion

Fri Mar 30

17:26

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

#3 by T. D. Noe at Sun Jan 30 15:25:34 EST 2011

STATUS

proposed

approved

#2 by Vincenzo Librandi at Sun Jan 30 04:08:56 EST 2011

PROG

(MAGMA) [ n: n in [0..1250] | IsPrime(n) and IsPrime(n^2+3*n+9)] [From Vincenzo Librandi, Jan 30 2011]

STATUS

approved

proposed

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

Numbers n with property that n and n^2+3n+9 are primes.

DATA

2, 7, 11, 17, 23, 29, 31, 37, 43, 73, 101, 107, 127, 163, 179, 197, 239, 277, 281, 317, 331, 359, 367, 421, 457, 463, 487, 541, 569, 613, 617, 619, 661, 709, 739, 773, 787, 809, 823, 877, 941, 947, 953, 991, 1019, 1031, 1033, 1039, 1051, 1087, 1163, 1187

OFFSET

1,1

COMMENTS

Or, primes in A175282.

MATHEMATICA

Select[Prime[Range[400]], PrimeQ[ #^2+3*#+9]&]

CROSSREFS

Cf. A005471, A175281-2.

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Mar 21 2010

STATUS

approved