The On-Line Encyclopedia of Integer Sequences (OEIS)

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A156300

Primes p such that 4*p - 5 is also prime.
(history; published version)

#8 by Charles R Greathouse IV at Thu Sep 08 08:45:41 EDT 2022

PROG

(MAGMAMagma) [p: p in PrimesUpTo(1400) | IsPrime(4*p - 5)]; // Vincenzo Librandi, Oct 31 2012

Discussion

Thu Sep 08

08:45

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

#7 by Joerg Arndt at Thu Nov 01 07:53:44 EDT 2012

STATUS

proposed

approved

#6 by Vincenzo Librandi at Wed Oct 31 08:33:05 EDT 2012

STATUS

editing

proposed

#5 by Vincenzo Librandi at Wed Oct 31 08:32:53 EDT 2012

NAME

Primes p such that 4*p - 5 is a also prime number.

LINKS

Vincenzo Librandi, <a href="/A156300/b156300.txt">Table of n, a(n) for n = 1..1000</a>

EXAMPLE

For p=2, 4p-5=3; p=19, 4p-5=71; p=127, 4p-5=503

MATHEMATICA

Select[Prime[Range[1400]], PrimeQ[(4# - 5)]&] (* Vincenzo Librandi, Oct 31 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1400) | IsPrime(4*p - 5)]; // Vincenzo Librandi, Oct 31 2012

CROSSREFS

Cf. A156287, A156288.

KEYWORD

nonn,easy

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 18:38:07 EDT 2012

AUTHOR

_Vincenzo Librandi (vincenzo.librandi(AT)tin.it), _, Feb 07 2009

Discussion

Fri Mar 30

18:38

OEIS Server: https://oeis.org/edit/global/215

#3 by N. J. A. Sloane at Sun Jul 11 03:00:00 EDT 2010

PROG

(MAGMA) [p: p in PrimesUpTo(10000)| IsPrime(4*p-5)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Apr 01 2010]

KEYWORD

nonn,new

nonn

EXTENSIONS

More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Apr 01 2010

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

DATA

2, 3, 7, 13, 19, 43, 61, 67, 79, 97, 109, 127, 11, 151, 163, 181, 211, 223, 229, 277, 307, 331, 373, 379, 397, 457, 463, 523, 601, 607, 613, 673, 727, 733, 751, 757, 853, 883, 907, 919, 967, 1021, 1033, 1069, 1117, 1171, 1201, 1231, 1237, 1321, 1327, 1381, 1399

PROG

(MAGMA) [p: p in PrimesUpTo(10000)| IsPrime(4*p-5)] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Apr 01 2010]

KEYWORD

nonn,new

nonn

EXTENSIONS

More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Apr 01 2010

#1 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

NAME

Primes p such that 4*p-5 is a prime number

DATA

2, 3, 7, 13, 19, 43, 61, 67, 79, 97, 109, 127, 11, 163, 181, 211, 223, 229, 277, 307, 331, 373, 379, 397, 457, 463, 523, 601, 607, 613, 673, 727, 733, 751, 757, 853, 883, 907, 919, 967

OFFSET

1,1

EXAMPLE

For p=2, 4p-5=3; p=19, 4p-5=71; p=127, 4p-5=503

CROSSREFS

Cf. A156287, A156288

KEYWORD

nonn,new

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Feb 07 2009

STATUS

approved