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Revision History for A107144 (Bold, blue-underlined text is an addition; faded, red-underlined text is a deletion.)

Showing entries 1-10 | older changes
A107144
Primes of the form 5x^2 + 8y^2.
(history; published version)
#23 by Charles R Greathouse IV at Thu Sep 08 08:45:18 EDT 2022
PROG

(MAGMAMagma) [5] cat [ p: p in PrimesUpTo(3000) | p mod 40 in {13, 37} ]; // Vincenzo Librandi, Jul 24 2012

Discussion
Thu Sep 08
08:45
OEIS Server: https://oeis.org/edit/global/2944
#22 by Charles R Greathouse IV at Thu Feb 09 14:38:31 EST 2017
STATUS

editing

approved

#21 by Charles R Greathouse IV at Thu Feb 09 14:38:28 EST 2017
NAME

Primes of the form 5x^2 + 8y^2.

COMMENTS

Discriminant = -160. See A107132 for more information.

Except for 5, also primes of the form 13x^2 + 8xy + 32y^2. See A140633. - T. D. Noe, May 19 2008

PROG

(PARI) list(lim)=my(v=List([5]), t); forprime(p=13, lim, t=p%40; if(t==13||t==37, listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Feb 09 2017

STATUS

approved

editing

#20 by OEIS Server at Sat Aug 09 09:31:21 EDT 2014
LINKS

Vincenzo Librandi and Ray Chandler, <a href="/A107144/b107144_1.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]

#19 by Ray Chandler at Sat Aug 09 09:31:21 EDT 2014
STATUS

editing

approved

Discussion
Sat Aug 09
09:31
OEIS Server: Installed new b-file as b107144.txt.  Old b-file is now b107144_1.txt.
#18 by Ray Chandler at Sat Aug 09 09:31:17 EDT 2014
LINKS

N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

#17 by Ray Chandler at Sat Aug 09 09:30:56 EDT 2014
LINKS

Vincenzo Librandi, <a href="/A107144/b107144.txt">Table of n, a(n) for n = 1..1000</a>

Vincenzo Librandi and Ray Chandler, <a href="/A107144/b107144_1.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]

STATUS

approved

editing

#16 by N. J. A. Sloane at Tue Aug 05 14:15:33 EDT 2014
MATHEMATICA

QuadPrimesQuadPrimes2[5, 0, 8, 10000] (* see A106856 *)

Discussion
Tue Aug 05
14:15
OEIS Server: https://oeis.org/edit/global/2284
#15 by N. J. A. Sloane at Tue Aug 05 14:12:11 EDT 2014
MATHEMATICA

QuadPrimes[5, 0, 8, 10000] (* see A106856 *) Note: the original QuadPrimes had a bug which could sometimes give wrong answers. This sequence should be checked (unless the coefficient of xy in the quadratic form is zero, in which case QuadPrimes gives correct answers). - N. J. A. Sloane, Jun 04 2014

QuadPrimes[5, 0, 8, 10000] (* see A106856 *)

Discussion
Tue Aug 05
14:12
OEIS Server: https://oeis.org/edit/global/2282
#14 by N. J. A. Sloane at Mon Jun 16 11:28:42 EDT 2014
MATHEMATICA

QuadPrimes[5, 0, 8, 10000] (* see A106856 *) Note: the original QuadPrimes had a bug which could sometimes give wrong answers. This sequence should be checked (unless the coefficient of xy in the quadratic form is zero, in which case QuadPrimes gives correct answers). - N. J. A. Sloane, Jun 04 2014

Discussion
Mon Jun 16
11:28
OEIS Server: https://oeis.org/edit/global/2234

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