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

Revision History for A059453

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A059453

Sophie Germain primes (A005384) that are not safe primes (A005385).
(history; published version)

#27 by OEIS Server at Mon Jul 15 10:23:48 EDT 2024

LINKS

Amiram Eldar, <a href="/A059453/b059453_1.txt">Table of n, a(n) for n = 1..10000</a>

#26 by Michael De Vlieger at Mon Jul 15 10:23:48 EDT 2024

STATUS

reviewed

Discussion

Mon Jul 15

10:23

OEIS Server: Installed first b-file as b059453.txt.

#25 by Joerg Arndt at Mon Jul 15 02:09:25 EDT 2024

STATUS

proposed

#24 by Amiram Eldar at Mon Jul 15 02:00:28 EDT 2024

STATUS

editing

#23 by Amiram Eldar at Mon Jul 15 01:47:38 EDT 2024

PROG

CROSSREFS

Cf. A005384, A005385, A053176, A059452, A059453, A059454, A059455, A059456, A007700, A005602, A023272, A023302, A023330.

#22 by Amiram Eldar at Mon Jul 15 01:46:55 EDT 2024

NAME

Sophie Germain primes (A005384) which are not safe primes (A005385).

COMMENTS

A156660(a(n))*(1-A156659(a(n))) = 1. - Reinhard Zumkeller, Feb 18 2009

LINKS

C. K. Caldwell, <a href="https://t5k.org/glossary/page.php/CunninghamChain">Cunningham Chains</a>

FORMULA

EXAMPLE

89 is here because (89-1)/2=44 is not prime, but 2*89 + 1 = 179 is prime. Except for 2 and 3 these primes are congruent to 5 or 11 modulo 12. Introducing terms of Cunningham chains of first kind.

CROSSREFS

Cf. A005384, A005385, A053176, A059452-A059456, A007700, A005602, A023272, A023302, A023330.

#21 by Amiram Eldar at Mon Jul 15 01:45:48 EDT 2024

LINKS

STATUS

approved

#20 by Charles R Greathouse IV at Mon Apr 03 10:36:09 EDT 2023

LINKS

C. K. Caldwell, <a href="http://primes.utm.edu/glossary/page.php/CunninghamChain">Cunningham Chains</a>

Discussion

Mon Apr 03

10:36

OEIS Server: https://oeis.org/edit/global/2966

#19 by Alois P. Heinz at Tue Jul 12 18:17:00 EDT 2022

STATUS

proposed

#18 by Chai Wah Wu at Tue Jul 12 18:12:27 EDT 2022

STATUS

editing