login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106881 Primes of the form x^2+xy+9y^2. 7

%I #24 Jan 15 2016 10:53:09

%S 11,29,71,79,109,149,151,179,191,211,239,281,331,359,379,389,401,421,

%T 431,449,491,499,541,569,571,599,631,641,659,701,709,739,751,809,821,

%U 911,919,991,1009,1019,1031,1051,1061,1129,1171,1201,1229,1289,1381

%N Primes of the form x^2+xy+9y^2.

%C Discriminant=-35.

%C Also, primes of the form x^2-xy+9y^2, with x and y nonnegative.

%C Also, primes which are squares (mod 35). A subsequence of A191026. - _M. F. Hasler_, Jan 15 2016

%H Vincenzo Librandi and Ray Chandler, <a href="/A106881/b106881.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi]

%H 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)

%t QuadPrimes2[1, -1, 9, 10000] (* see A106856 *)

%o (PARI) select(p->issquare(Mod(p,35))&&isprime(p),[1..1000]) \\ _M. F. Hasler_, Jan 15 2016

%Y Primes in A243178.

%K nonn,easy

%O 1,1

%A _T. D. Noe_, May 09 2005

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 9 17:14 EDT 2024. Contains 372354 sequences. (Running on oeis4.)