The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A023247

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A023247

Primes p such that 3*p + 4 and 9*p + 16 are also prime.
(history; published version)

#38 by Alois P. Heinz at Tue Aug 20 15:32:16 EDT 2024

STATUS

proposed

approved

#37 by Robert C. Lyons at Tue Aug 20 15:08:57 EDT 2024

STATUS

editing

proposed

#36 by Robert C. Lyons at Tue Aug 20 15:08:55 EDT 2024

PROG

(Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(3*n+4) and IsPrime(9*n+16)] ; // Vincenzo Librandi, Aug 04 2010

STATUS

approved

editing

#35 by Amiram Eldar at Mon Aug 05 06:26:46 EDT 2024

STATUS

reviewed

approved

#34 by Joerg Arndt at Mon Aug 05 06:07:12 EDT 2024

STATUS

proposed

reviewed

#33 by Jason Yuen at Mon Aug 05 05:40:21 EDT 2024

STATUS

editing

proposed

#32 by Jason Yuen at Mon Aug 05 05:40:15 EDT 2024

PROG

(PARI) select( is(p)=isprime(3*p+4)&&isprime(9*p+16)&&isprime(p), primes([2, 5500]) ) \\ Defines the is() function. The select() command provides a check & illustration. isprime(p) at the end improves performance if a selection is operated on primes as here. - M. F. Hasler, Nov 23 2018

STATUS

approved

editing

#31 by Charles R Greathouse IV at Thu Sep 08 08:44:47 EDT 2022

PROG

(MAGMAMagma) [n: n in [0..100000] | IsPrime(n) and IsPrime(3*n+4) and IsPrime(9*n+16)] // Vincenzo Librandi, Aug 04 2010

Discussion

Thu Sep 08

08:44

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

#30 by Bruno Berselli at Thu Dec 06 03:53:46 EST 2018

STATUS

reviewed

approved

#29 by Michel Marcus at Sat Nov 24 01:36:24 EST 2018

STATUS

proposed

reviewed