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



(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106987 Primes of the form 5x^2-3xy+5y^2, with x and y nonnegative. 1


%S 5,7,19,41,47,73,89,167,223,227,229,241,293,383,397,461,509,577,587,

%T 619,661,769,773,787,811,853,929,1021,1097,1123,1181,1237,1279,1319,

%U 1321,1399,1487,1489,1553,1571,1627,1657,1669,1697,1753,1783,1987

%N Primes of the form 5x^2-3xy+5y^2, with x and y nonnegative.

%C Discriminant=-91.

%H Vincenzo Librandi and Ray Chandler, <a href="/A106987/b106987.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[5, -3, 5, 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 October 21 23:34 EDT 2021. Contains 348160 sequences. (Running on oeis4.)