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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106988 Primes of the form x^2+xy+23y^2, with x and y nonnegative. 1

%I

%S 23,29,43,53,79,107,113,127,179,191,211,233,263,277,337,347,373,389,

%T 443,491,547,599,641,653,659,673,701,751,757,809,883,907,911,919,953,

%U 991,1031,1093,1171,1187,1213,1283,1297,1303,1327,1381,1429,1439,1453

%N Primes of the form x^2+xy+23y^2, with x and y nonnegative.

%C Discriminant=-91.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106988/b106988.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, 23, 10000] (* see A106856 *)

%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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 19 18:36 EDT 2021. Contains 347564 sequences. (Running on oeis4.)