login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139999 Primes of the form 3x^2+440y^2. 2
3, 443, 467, 587, 683, 947, 1307, 1523, 1787, 1907, 2003, 2027, 2267, 2843, 2963, 3083, 3323, 3347, 3947, 4283, 4547, 4643, 5003, 5483, 5867, 5987, 6323, 6803, 7043, 7187, 7283, 7307, 7547, 7643, 7907, 8123, 8243, 8363, 8387, 8627, 8867 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-5280. See A139827 for more information.

LINKS

Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi]

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

FORMULA

Except for 3, the primes are congruent to {203, 323, 443, 467, 587, 683, 707, 947, 1043, 1307} (mod 1320).

MATHEMATICA

QuadPrimes2[3, 0, 440, 10000] (* see A106856 *)

PROG

(MAGMA) [3] cat [p: p in PrimesUpTo(12000) | p mod 1320 in [203, 323, 443, 467, 587, 683, 707, 947, 1043, 1307]]; // Vincenzo Librandi, Aug 03 2012

CROSSREFS

Sequence in context: A086207 A326373 A092052 * A140870 A157601 A094454

Adjacent sequences:  A139996 A139997 A139998 * A140000 A140001 A140002

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 02 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 30 13:47 EST 2021. Contains 349420 sequences. (Running on oeis4.)