The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A181602 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A181602

Primes p such that p-1 is a semiprime and p+2 is prime or prime squared.
(history; published version)

#31 by Charles R Greathouse IV at Thu Sep 08 08:45:54 EDT 2022

PROG

(MAGMAMagma) [ p: p in PrimesInInterval(3, 15000) | &+[ k[2]: k in Factorization(p-1) ] eq 2 and (IsPrime(p+2) or (q^2 eq p+2 and IsPrime(q) where q is Isqrt(p+2))) ]; // Klaus Brockhaus, Nov 03 2010

Discussion

Thu Sep 08

08:45

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

#30 by Joerg Arndt at Sun May 06 02:25:58 EDT 2018

STATUS

reviewed

approved

#29 by Michel Marcus at Sun May 06 01:13:38 EDT 2018

STATUS

proposed

reviewed

#28 by Jon E. Schoenfield at Sun May 06 01:10:48 EDT 2018

STATUS

editing

proposed

#27 by Jon E. Schoenfield at Sun May 06 01:10:46 EDT 2018

PROG

(MAGMA) [ p: p in PrimesInInterval(3, 15000) | &+[ k[2]: k in Factorization(p-1) ] eq 2 and (IsPrime(p+2) or (q^2 eq p+2 and IsPrime(q) where q is Isqrt(p+2))) ]; [_// _Klaus Brockhaus_, Nov 03 2010]

STATUS

approved

editing

#26 by Alois P. Heinz at Wed Apr 17 10:51:36 EDT 2013

STATUS

reviewed

approved

#25 by Joerg Arndt at Wed Apr 17 02:39:11 EDT 2013

STATUS

proposed

reviewed

#24 by Vincenzo Librandi at Wed Apr 17 01:44:56 EDT 2013

STATUS

editing

proposed

#23 by Vincenzo Librandi at Wed Apr 17 01:44:42 EDT 2013

LINKS

Vincenzo Librandi, <a href="/A181602/b181602.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#22 by T. D. Noe at Mon Feb 25 12:18:01 EST 2013

STATUS

editing

approved