The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A104635 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A104635

Odd n such that 2*n+1 is prime.
(history; published version)

#23 by Charles R Greathouse IV at Thu Sep 08 08:45:17 EDT 2022

PROG

(MAGMAMagma) [n: n in [1..500 by 2] | IsPrime(2*n+1)]; // Vincenzo Librandi, Aug 14 2018

Discussion

Thu Sep 08

08:45

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

#22 by Susanna Cuyler at Tue Aug 14 09:00:03 EDT 2018

STATUS

proposed

approved

#21 by Vincenzo Librandi at Tue Aug 14 01:29:39 EDT 2018

STATUS

editing

proposed

#20 by Vincenzo Librandi at Tue Aug 14 01:29:19 EDT 2018

DATA

1, 3, 5, 9, 11, 15, 21, 23, 29, 33, 35, 39, 41, 51, 53, 63, 65, 69, 75, 81, 83, 89, 95, 99, 105, 111, 113, 119, 125, 131, 135, 141, 153, 155, 165, 173, 179, 183, 189, 191, 209, 215, 219, 221, 231, 233, 239, 243, 245, 249, 251, 261, 273, 281, 285, 293, 299

PROG

(MAGMA) [n: n in [1..500 by 2] | IsPrime(2*n+1)]; // Vincenzo Librandi, Aug 14 2018

STATUS

proposed

editing

#19 by Michel Marcus at Tue Aug 14 01:12:34 EDT 2018

STATUS

editing

proposed

#18 by Michel Marcus at Tue Aug 14 01:12:31 EDT 2018

CROSSREFS

Cf. A002145, A005097, A104636.

STATUS

proposed

editing

#17 by G. C. Greubel at Tue Aug 14 00:51:26 EDT 2018

STATUS

editing

proposed

#16 by G. C. Greubel at Tue Aug 14 00:51:13 EDT 2018

NAME

Odd n such that 2n2*n+1 is prime.

LINKS

G. C. Greubel, <a href="/A104635/b104635.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#15 by Charles R Greathouse IV at Tue Jun 13 01:35:35 EDT 2017

STATUS

editing

approved

#14 by Charles R Greathouse IV at Tue Jun 13 01:35:29 EDT 2017

PROG

(PARI) forstep( k=1, 250, 2, isprime(2*k+1) & & print1(k", ")) \\ M. F. Hasler, Feb 25 2011

(PARI) forprime( p=1, 500, p%4==3 | | next; print1(p\2", ")) \\ M. F. Hasler, Feb 25 2011

STATUS

approved

editing