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Revision History for A002327

(Bold, blue-underlined text is an addition; faded, red-underlined text is a deletion.)

Showing entries 1-10 | older changes
A002327
Primes of the form k^2 - k - 1.
(history; published version)
#91 by Michael De Vlieger at Tue Oct 10 23:01:46 EDT 2023
STATUS

proposed

approved

#90 by Charles R Greathouse IV at Tue Oct 10 22:53:09 EDT 2023
STATUS

editing

proposed

#89 by Charles R Greathouse IV at Tue Oct 10 22:42:27 EDT 2023
FORMULA

a(n) >> n^2 log n by Brun's sieve. - Charles R Greathouse IV, Oct 10 2023

PROG

(PARI) list(lim)=my(v=List(), p); forstep(n=5, sqrtint(4*lim+5), 2, if(isprime(p=(n^2-5)/4), listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Oct 10 2023

STATUS

approved

editing

#88 by Michel Marcus at Thu Sep 08 04:30:31 EDT 2022
STATUS

reviewed

approved

#87 by Kevin Ryde at Thu Sep 08 04:21:54 EDT 2022
STATUS

proposed

reviewed

#86 by Joerg Arndt at Thu Sep 08 01:25:57 EDT 2022
STATUS

editing

proposed

Discussion
Thu Sep 08
02:03
Michel Marcus: then move your comment to A034100 ?
02:09
Charles Kusniec: Michel, if you are going to change it, I think it is more appropriate to change it to A002378.
02:11
Charles Kusniec: I mean, change it to A165900.
02:13
Michel Marcus: no, not me , you
02:20
Charles Kusniec: OK. No problem. Please, cancel this comment to avoid conflit. Thank you.
#85 by Joerg Arndt at Thu Sep 08 01:23:54 EDT 2022
COMMENTS

For a(n)>29, the fractional part of square root of a(n) starts with digit 4 (see A034100). - Charles Kusniec, Sep 06 2022

STATUS

proposed

editing

Discussion
Thu Sep 08
01:25
Joerg Arndt: people interested in "Fractional part of square root of a(n) starts with digit 4." will find A034100. Here this comment is just a red herring.
#84 by Amiram Eldar at Wed Sep 07 16:56:09 EDT 2022
STATUS

editing

proposed

#83 by Amiram Eldar at Wed Sep 07 16:56:07 EDT 2022
PROG

(MAGMAMagma) [ a: n in [0..150] | IsPrime(a) where a is n^2 - n - 1 ]; // Vincenzo Librandi, Aug 01 2011

STATUS

proposed

editing

#82 by Michel Marcus at Wed Sep 07 16:49:56 EDT 2022
STATUS

editing

proposed

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