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⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Showing entries 1-10 | older changes
Numbers k such that both k*(k + 1) + 1 and k*(k - 1) + 1 are primes.
#37 by Charles R Greathouse IV at Thu Sep 08 08:45:09 EDT 2022
PROG
Discussion
Thu Sep 08
08:45
OEIS Server: https://oeis.org/edit/global/2944
#36 by Harvey P. Dale at Tue Jun 04 19:50:04 EDT 2019
STATUS
#35 by Harvey P. Dale at Tue Jun 04 19:50:01 EDT 2019
MATHEMATICA
STATUS
#34 by Susanna Cuyler at Sun May 06 00:43:31 EDT 2018
STATUS
#33 by Jon E. Schoenfield at Sun May 06 00:32:39 EDT 2018
STATUS
#32 by Jon E. Schoenfield at Sun May 06 00:32:37 EDT 2018
NAME
COMMENTS
EXAMPLE
STATUS
#31 by N. J. A. Sloane at Thu Oct 19 03:14:13 EDT 2017
EXTENSIONS
Discussion
Thu Oct 19
03:14
OEIS Server: https://oeis.org/edit/global/2703
#30 by Bruno Berselli at Wed Oct 07 10:05:59 EDT 2015
STATUS
#29 by Bruno Berselli at Wed Oct 07 10:05:54 EDT 2015
PROG
STATUS
#28 by Michel Marcus at Wed Oct 07 07:52:52 EDT 2015
STATUS
Discussion
Wed Oct 07
08:59
Joerg Arndt: Last Pari program is bad.